diff --git a/client/client.go b/client/client.go
index 8b21b17169e..b2543a4e49d 100644
--- a/client/client.go
+++ b/client/client.go
@@ -570,8 +570,18 @@ func (c *client) GetMinTS(ctx context.Context) (physical int64, logical int64, e
 	return minTS.Physical, minTS.Logical, nil
 }
 
+// EnableRouterClient enables the router client.
+// This is only for test currently.
+func (c *client) EnableRouterClient() {
+	c.inner.enableRouterClient.Store(true)
+}
+
+func (c *client) isRouterClientEnabled() bool {
+	return c.inner.enableRouterClient.Load()
+}
+
 // GetRegionFromMember implements the RPCClient interface.
-func (c *client) GetRegionFromMember(ctx context.Context, key []byte, memberURLs []string, _ ...opt.GetRegionOption) (*router.Region, error) {
+func (c *client) GetRegionFromMember(ctx context.Context, key []byte, memberURLs []string, opts ...opt.GetRegionOption) (*router.Region, error) {
 	if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
 		span = span.Tracer().StartSpan("pdclient.GetRegionFromMember", opentracing.ChildOf(span.Context()))
 		defer span.Finish()
@@ -620,6 +630,10 @@ func (c *client) GetRegion(ctx context.Context, key []byte, opts ...opt.GetRegio
 	ctx, cancel := context.WithTimeout(ctx, c.inner.option.Timeout)
 	defer cancel()
 
+	if c.isRouterClientEnabled() {
+		return c.inner.routerClient.GetRegion(ctx, key, opts...)
+	}
+
 	options := &opt.GetRegionOp{}
 	for _, opt := range opts {
 		opt(options)
@@ -660,6 +674,10 @@ func (c *client) GetPrevRegion(ctx context.Context, key []byte, opts ...opt.GetR
 	ctx, cancel := context.WithTimeout(ctx, c.inner.option.Timeout)
 	defer cancel()
 
+	if c.isRouterClientEnabled() {
+		return c.inner.routerClient.GetPrevRegion(ctx, key, opts...)
+	}
+
 	options := &opt.GetRegionOp{}
 	for _, opt := range opts {
 		opt(options)
@@ -700,6 +718,10 @@ func (c *client) GetRegionByID(ctx context.Context, regionID uint64, opts ...opt
 	ctx, cancel := context.WithTimeout(ctx, c.inner.option.Timeout)
 	defer cancel()
 
+	if c.isRouterClientEnabled() {
+		return c.inner.routerClient.GetRegionByID(ctx, regionID, opts...)
+	}
+
 	options := &opt.GetRegionOp{}
 	for _, opt := range opts {
 		opt(options)
diff --git a/client/clients/router/client.go b/client/clients/router/client.go
index 8d0cfd64d2d..8bd44b8b6a3 100644
--- a/client/clients/router/client.go
+++ b/client/clients/router/client.go
@@ -227,10 +227,7 @@ func requestFinisher(resp *pdpb.QueryRegionResponse) batch.FinisherFunc[*Request
 		} else if req.id != 0 {
 			id = req.id
 		}
-		region, ok := resp.RegionsById[id]
-		if !ok {
-			err = errs.ErrClientRegionNotFound.FastGenByArgs(id)
-		} else {
+		if region, ok := resp.RegionsById[id]; ok {
 			req.region = ConvertToRegion(region)
 		}
 		req.tryDone(err)
diff --git a/client/clients/router/request.go b/client/clients/router/request.go
index 2e1c2e97aa5..cc1ada0a729 100644
--- a/client/clients/router/request.go
+++ b/client/clients/router/request.go
@@ -80,12 +80,6 @@ func (c *Cli) GetRegion(ctx context.Context, key []byte, opts ...opt.GetRegionOp
 	return req.wait()
 }
 
-// GetRegionFromMember implements the Client interface.
-func (c *Cli) GetRegionFromMember(ctx context.Context, key []byte, _ []string, opts ...opt.GetRegionOption) (*Region, error) {
-	// Before we support the follower stream connection, this method is equivalent to `GetRegion`.
-	return c.GetRegion(ctx, key, opts...)
-}
-
 // GetPrevRegion implements the Client interface.
 func (c *Cli) GetPrevRegion(ctx context.Context, key []byte, opts ...opt.GetRegionOption) (*Region, error) {
 	req := c.newRequest(ctx)
diff --git a/client/errs/errno.go b/client/errs/errno.go
index 8f81d2d6777..99a426d0776 100644
--- a/client/errs/errno.go
+++ b/client/errs/errno.go
@@ -70,7 +70,6 @@ var (
 	ErrClientFindGroupByKeyspaceID    = errors.Normalize("can't find keyspace group by keyspace id", errors.RFCCodeText("PD:client:ErrClientFindGroupByKeyspaceID"))
 	ErrClientWatchGCSafePointV2Stream = errors.Normalize("watch gc safe point v2 stream failed", errors.RFCCodeText("PD:client:ErrClientWatchGCSafePointV2Stream"))
 	ErrCircuitBreakerOpen             = errors.Normalize("circuit breaker is open", errors.RFCCodeText("PD:client:ErrCircuitBreakerOpen"))
-	ErrClientRegionNotFound           = errors.Normalize("region %d not found", errors.RFCCodeText("PD:client:ErrClientRegionNotFound"))
 )
 
 // grpcutil errors
diff --git a/client/inner_client.go b/client/inner_client.go
index 269c2330f8e..464fd413e25 100644
--- a/client/inner_client.go
+++ b/client/inner_client.go
@@ -18,6 +18,7 @@ import (
 	"context"
 	"crypto/tls"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"go.uber.org/zap"
@@ -46,7 +47,12 @@ type innerClient struct {
 	serviceDiscovery sd.ServiceDiscovery
 	tokenDispatcher  *tokenDispatcher
 
-	routerClient *router.Cli
+	// The router client is used to get the region info via the streaming gRPC,
+	// this flag is used to control whether to enable it, currently only used
+	// in the test.
+	enableRouterClient atomic.Bool
+	routerClient       *router.Cli
+
 	// For service mode switching.
 	serviceModeKeeper
 
diff --git a/tests/integrations/client/client_test.go b/tests/integrations/client/client_test.go
index 91a6d44943e..b8c4c6b3d62 100644
--- a/tests/integrations/client/client_test.go
+++ b/tests/integrations/client/client_test.go
@@ -1025,12 +1025,18 @@ type clientTestSuite struct {
 	grpcPDClient    pdpb.PDClient
 	regionHeartbeat pdpb.PD_RegionHeartbeatClient
 	reportBucket    pdpb.PD_ReportBucketsClient
+
+	enableRouterClient bool
 }
 
 func TestClientTestSuite(t *testing.T) {
 	suite.Run(t, new(clientTestSuite))
 }
 
+func TestClientTestSuiteWithRouterClient(t *testing.T) {
+	suite.Run(t, &clientTestSuite{enableRouterClient: true})
+}
+
 func (suite *clientTestSuite) SetupSuite() {
 	var err error
 	re := suite.Require()
@@ -1044,6 +1050,9 @@ func (suite *clientTestSuite) SetupSuite() {
 
 	suite.ctx, suite.clean = context.WithCancel(context.Background())
 	suite.client = setupCli(suite.ctx, re, suite.srv.GetEndpoints())
+	if suite.enableRouterClient {
+		suite.client.(interface{ EnableRouterClient() }).EnableRouterClient()
+	}
 
 	suite.regionHeartbeat, err = suite.grpcPDClient.RegionHeartbeat(suite.ctx)
 	re.NoError(err)