diff --git a/splitio_platform_interface/lib/split_configuration.dart b/splitio_platform_interface/lib/split_configuration.dart
index 1d54fdd..c742c48 100644
--- a/splitio_platform_interface/lib/split_configuration.dart
+++ b/splitio_platform_interface/lib/split_configuration.dart
@@ -1,4 +1,5 @@
 import 'package:splitio_platform_interface/split_certificate_pinning_configuration.dart';
+import 'package:splitio_platform_interface/split_fallback_treatments_configuration.dart';
 import 'package:splitio_platform_interface/split_sync_config.dart';
 import 'package:splitio_platform_interface/split_rollout_cache_configuration.dart';
 
@@ -48,6 +49,10 @@ class SplitConfiguration {
   /// [readyTimeout] Maximum amount of time in seconds to wait before firing the SDK_READY_TIMED_OUT event. Defaults to 10 seconds.
   ///
   /// [certificatePinningConfiguration] Certificate pinning configuration. Pins need to have the format of a base64 SHA-256 or base64 SHA-1 hashes of the SPKI (ex.: "sha256/7HIpactkIAq2Y49orFOOQKurWxmmSFZhBCoQYcRhJ3Y="). Not supported in Web.
+  ///
+  /// [rolloutCacheConfiguration] Rollout cache configuration.
+  ///
+  /// [fallbackTreatments] Fallback treatments configuration.
   SplitConfiguration({
     int? featuresRefreshRate,
     int? segmentsRefreshRate,
@@ -76,6 +81,7 @@ class SplitConfiguration {
     int? readyTimeout = 10,
     CertificatePinningConfiguration? certificatePinningConfiguration,
     RolloutCacheConfiguration? rolloutCacheConfiguration,
+    FallbackTreatmentsConfiguration? fallbackTreatments,
   }) {
     if (featuresRefreshRate != null) {
       configurationMap['featuresRefreshRate'] = featuresRefreshRate;
@@ -195,6 +201,13 @@ class SplitConfiguration {
         'clearOnInit': rolloutCacheConfiguration.clearOnInit
       };
     }
+
+    if (fallbackTreatments != null) {
+      configurationMap['fallbackTreatments'] = {
+        'global': fallbackTreatments.global,
+        'byFlag': fallbackTreatments.byFlag
+      };
+    }
   }
 }
 
diff --git a/splitio_platform_interface/lib/split_fallback_treatment.dart b/splitio_platform_interface/lib/split_fallback_treatment.dart
new file mode 100644
index 0000000..bb52ed9
--- /dev/null
+++ b/splitio_platform_interface/lib/split_fallback_treatment.dart
@@ -0,0 +1,6 @@
+class FallbackTreatment {
+  final String treatment;
+  final String? config;
+
+  const FallbackTreatment(this.treatment, [this.config]);
+}
diff --git a/splitio_platform_interface/lib/split_fallback_treatments_configuration.dart b/splitio_platform_interface/lib/split_fallback_treatments_configuration.dart
new file mode 100644
index 0000000..d3c3c8d
--- /dev/null
+++ b/splitio_platform_interface/lib/split_fallback_treatments_configuration.dart
@@ -0,0 +1,18 @@
+import 'package:splitio_platform_interface/split_fallback_treatment.dart';
+
+class FallbackTreatmentsConfiguration {
+  Map<String, String?>? _global;
+  Map<String, Map<String, String?>>? _byFlag;
+
+  Map<String, String?>? get global => _global;
+  Map<String, Map<String, String?>>? get byFlag => _byFlag;
+
+  FallbackTreatmentsConfiguration(
+      {FallbackTreatment? global, Map<String, FallbackTreatment>? byFlag}) {
+    _global = global != null
+        ? {'treatment': global.treatment, 'config': global.config}
+        : null;
+    _byFlag = byFlag?.map((key, value) =>
+        MapEntry(key, {'treatment': value.treatment, 'config': value.config}));
+  }
+}
diff --git a/splitio_platform_interface/test/split_fallback_treatments_configuration_test.dart b/splitio_platform_interface/test/split_fallback_treatments_configuration_test.dart
new file mode 100644
index 0000000..2dd3990
--- /dev/null
+++ b/splitio_platform_interface/test/split_fallback_treatments_configuration_test.dart
@@ -0,0 +1,39 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:splitio_platform_interface/split_fallback_treatment.dart';
+import 'package:splitio_platform_interface/split_fallback_treatments_configuration.dart';
+
+void main() {
+  test('global and by flag fallback treatments', () {
+    var config = FallbackTreatmentsConfiguration(
+        global: const FallbackTreatment('custom-treatment'));
+
+    expect(config.global,
+        equals({'treatment': 'custom-treatment', 'config': null}));
+    expect(config.byFlag, null);
+
+    config = FallbackTreatmentsConfiguration(byFlag: {
+      'flag1': const FallbackTreatment('custom-treatment-1', 'custom-config-1'),
+      'flag2': const FallbackTreatment('custom-treatment-2', 'custom-config-2')
+    });
+    expect(
+        config.byFlag,
+        equals({
+          'flag1': {
+            'treatment': 'custom-treatment-1',
+            'config': 'custom-config-1'
+          },
+          'flag2': {
+            'treatment': 'custom-treatment-2',
+            'config': 'custom-config-2'
+          }
+        }));
+    expect(config.global, null);
+  });
+
+  test('default values', () {
+    var config = FallbackTreatmentsConfiguration();
+
+    expect(config.global, null);
+    expect(config.byFlag, null);
+  });
+}
diff --git a/splitio_platform_interface/test/splitio_configuration_test.dart b/splitio_platform_interface/test/splitio_configuration_test.dart
index 64b758c..c627edb 100644
--- a/splitio_platform_interface/test/splitio_configuration_test.dart
+++ b/splitio_platform_interface/test/splitio_configuration_test.dart
@@ -1,6 +1,8 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:splitio_platform_interface/split_certificate_pinning_configuration.dart';
 import 'package:splitio_platform_interface/split_configuration.dart';
+import 'package:splitio_platform_interface/split_fallback_treatment.dart';
+import 'package:splitio_platform_interface/split_fallback_treatments_configuration.dart';
 import 'package:splitio_platform_interface/split_rollout_cache_configuration.dart';
 import 'package:splitio_platform_interface/split_sync_config.dart';
 
@@ -36,7 +38,16 @@ void main() {
             .addPin('host1', 'pin1')
             .addPin('host2', 'pin3')
             .addPin('host1', 'pin2'),
-        rolloutCacheConfiguration: RolloutCacheConfiguration(expirationDays: 15, clearOnInit: true));
+        rolloutCacheConfiguration:
+            RolloutCacheConfiguration(expirationDays: 15, clearOnInit: true),
+        fallbackTreatments: FallbackTreatmentsConfiguration(
+          global: const FallbackTreatment('custom-treatment'),
+          byFlag: {
+            'flag1': const FallbackTreatment(
+                'custom-treatment-flag1', 'config-flag1'),
+            'flag2': const FallbackTreatment('custom-treatment-flag2'),
+          },
+        ));
 
     expect(config.configurationMap['eventFlushInterval'], 2000);
     expect(config.configurationMap['eventsPerPush'], 300);
@@ -73,8 +84,22 @@ void main() {
       'host1': ['pin1', 'pin2'],
       'host2': ['pin3']
     });
-    expect(config.configurationMap['rolloutCacheConfiguration']['expirationDays'], 15);
-    expect(config.configurationMap['rolloutCacheConfiguration']['clearOnInit'], true);
+    expect(
+        config.configurationMap['rolloutCacheConfiguration']['expirationDays'],
+        15);
+    expect(config.configurationMap['rolloutCacheConfiguration']['clearOnInit'],
+        true);
+    expect(config.configurationMap['fallbackTreatments']['global'],
+        equals({'treatment': 'custom-treatment', 'config': null}));
+    expect(
+        config.configurationMap['fallbackTreatments']['byFlag'],
+        equals({
+          'flag1': {
+            'treatment': 'custom-treatment-flag1',
+            'config': 'config-flag1'
+          },
+          'flag2': {'treatment': 'custom-treatment-flag2', 'config': null}
+        }));
   });
 
   test('no special values leaves map empty', () async {