diff --git a/packages/core/src/tracing/transaction.ts b/packages/core/src/tracing/transaction.ts
index eba498b7e654..8fe01e5afcce 100644
--- a/packages/core/src/tracing/transaction.ts
+++ b/packages/core/src/tracing/transaction.ts
@@ -10,6 +10,7 @@ import type {
   TransactionMetadata,
 } from '@sentry/types';
 import { dropUndefinedKeys, logger } from '@sentry/utils';
+import { Replay } from '@sentry/replay';
 
 import { DEFAULT_ENVIRONMENT } from '../constants';
 import type { Hub } from '../hub';
@@ -241,6 +242,7 @@ export class Transaction extends SpanClass implements TransactionInterface {
    * @experimental
    */
   public getDynamicSamplingContext(): Readonly<Partial<DynamicSamplingContext>> {
+    console.log('dsc');
     if (this._frozenDynamicSamplingContext) {
       return this._frozenDynamicSamplingContext;
     }
@@ -261,6 +263,12 @@ export class Transaction extends SpanClass implements TransactionInterface {
 
     const source = this.metadata.source;
 
+    const replay = client.getIntegration(Replay);
+    let replay_id;
+    if (replay) {
+      replay_id = replay.getCurrentReplayId();
+    }
+
     // We don't want to have a transaction name in the DSC if the source is "url" because URLs might contain PII
     const transaction = source && source !== 'url' ? this.name : undefined;
 
@@ -272,6 +280,7 @@ export class Transaction extends SpanClass implements TransactionInterface {
       public_key,
       trace_id: this.traceId,
       sample_rate,
+      replay_id,
     });
 
     // Uncomment if we want to make DSC immutable
diff --git a/packages/replay/src/integration.ts b/packages/replay/src/integration.ts
index c08eb0431cac..eb4704a57fda 100644
--- a/packages/replay/src/integration.ts
+++ b/packages/replay/src/integration.ts
@@ -226,6 +226,14 @@ Sentry.init({ replaysOnErrorSampleRate: ${errorSampleRate} })`,
     return this._replay.flushImmediate();
   }
 
+  /** returns the current replayId if there is an existing session */
+  public getCurrentReplayId(): string | undefined {
+    if (!this._replay || !this._replay.session) {
+      return;
+    }
+    return this._replay.session.id;
+  }
+
   /** Setup the integration. */
   private _setup(): void {
     // Client is not available in constructor, so we need to wait until setupOnce
diff --git a/packages/tracing/src/browser/request.ts b/packages/tracing/src/browser/request.ts
index e1e1c9aaf7fb..24772e0ef6f8 100644
--- a/packages/tracing/src/browser/request.ts
+++ b/packages/tracing/src/browser/request.ts
@@ -160,6 +160,7 @@ export function fetchCallback(
   shouldAttachHeaders: (url: string) => boolean,
   spans: Record<string, Span>,
 ): void {
+  console.log(2);
   if (!hasTracingEnabled() || !(handlerData.fetchData && shouldCreateSpan(handlerData.fetchData.url))) {
     return;
   }
@@ -294,6 +295,7 @@ export function xhrCallback(
   shouldAttachHeaders: (url: string) => boolean,
   spans: Record<string, Span>,
 ): void {
+  console.log(1);
   if (
     !hasTracingEnabled() ||
     (handlerData.xhr && handlerData.xhr.__sentry_own_request__) ||