diff --git a/pkg/plugins/pre-request/pd_prerequest.go b/pkg/plugins/pre-request/pd_prerequest.go
index 43ecca42..a9e340ce 100644
--- a/pkg/plugins/pre-request/pd_prerequest.go
+++ b/pkg/plugins/pre-request/pd_prerequest.go
@@ -23,7 +23,8 @@ const (
 )
 
 type prefillHeaderHandlerParameters struct {
-	PrefillProfile string `json:"prefillProfile"`
+	PrefillProfile    string `json:"prefillProfile"`
+	PrefillTargetPort int    `json:"prefillTargetPort,omitempty"` // Optional field
 }
 
 // compile-time type assertion
@@ -32,28 +33,31 @@ var _ requestcontrol.PreRequest = &PrefillHeaderHandler{}
 // PrefillHeaderHandlerFactory  defines the factory function for the PrefillHeaderHandler
 func PrefillHeaderHandlerFactory(name string, rawParameters json.RawMessage, _ plugins.Handle) (plugins.Plugin, error) {
 	parameters := prefillHeaderHandlerParameters{
-		PrefillProfile: defaultPrefillProfile,
+		PrefillProfile:    defaultPrefillProfile,
+		PrefillTargetPort: 0,
 	}
 	if rawParameters != nil {
 		if err := json.Unmarshal(rawParameters, &parameters); err != nil {
 			return nil, fmt.Errorf("failed to parse the parameters of the '%s' pre-request plugin - %w", PrefillHeaderHandlerType, err)
 		}
 	}
-	return NewPrefillHeaderHandler(parameters.PrefillProfile).WithName(name), nil
+	return NewPrefillHeaderHandler(parameters.PrefillProfile, parameters.PrefillTargetPort).WithName(name), nil
 }
 
 // NewPrefillHeaderHandler initializes a new PrefillHeaderHandler and returns its pointer.
-func NewPrefillHeaderHandler(prefillProfile string) *PrefillHeaderHandler {
+func NewPrefillHeaderHandler(prefillProfile string, prefillTargetPort int) *PrefillHeaderHandler {
 	return &PrefillHeaderHandler{
-		typedName:      plugins.TypedName{Type: PrefillHeaderHandlerType},
-		prefillProfile: prefillProfile,
+		typedName:         plugins.TypedName{Type: PrefillHeaderHandlerType},
+		prefillProfile:    prefillProfile,
+		prefillTargetPort: prefillTargetPort,
 	}
 }
 
 // PrefillHeaderHandler PreRequest plugin
 type PrefillHeaderHandler struct {
-	typedName      plugins.TypedName
-	prefillProfile string
+	typedName         plugins.TypedName
+	prefillProfile    string
+	prefillTargetPort int // 0 means "not configured"
 }
 
 // TypedName returns the typed name of the plugin.
@@ -78,6 +82,10 @@ func (p *PrefillHeaderHandler) PreRequest(_ context.Context, request *types.LLMR
 		return // prefill profile failed to run or we chose not to run it, no-op in this case
 	}
 
-	prefillHostPort := net.JoinHostPort(prefillProfileRunResult.TargetPods[0].GetPod().Address, strconv.Itoa(targetPort))
+	portToUse := targetPort      // Default: use existing behavior
+	if p.prefillTargetPort > 0 { // Only override if configured
+		portToUse = p.prefillTargetPort
+	}
+	prefillHostPort := net.JoinHostPort(prefillProfileRunResult.TargetPods[0].GetPod().Address, strconv.Itoa(portToUse))
 	request.Headers[prefillPodHeader] = prefillHostPort // in the form of <ip:port>
 }