diff --git a/.github/reviewer-lottery.yml b/.github/reviewer-lottery.yml
new file mode 100644
index 0000000000..cad974b577
--- /dev/null
+++ b/.github/reviewer-lottery.yml
@@ -0,0 +1,10 @@
+groups:
+  - name: external-zkevm-reviewers
+    reviewers: 1
+    internal_reviewers: 1
+    usernames:
+      - DreamWuGit
+      - HAOYUatHZ
+      - roynalnaruto
+      - lispc
+      - icemelon
diff --git a/.github/workflows/external_reviewers_assig.yml b/.github/workflows/external_reviewers_assig.yml
new file mode 100644
index 0000000000..70a457ed38
--- /dev/null
+++ b/.github/workflows/external_reviewers_assig.yml
@@ -0,0 +1,13 @@
+name: "Reviewer lottery"
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: uesteibar/reviewer-lottery@v2
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}