Python: mock imported module method

I have to test if the method pyautogui.click() is called. This is my Player.py file:

# Player.py

import pyautogui

class Player:
    def play():
        pyautogui.click(100, 100)

And this is my test file:

# Test_Player.py

import unittest
from Player import Player

class Test_Player(unittest.TestCase):
    def test_play(self):
        player = Player()
        player.play()
        # assert pyautogui.click is called once

I tried with pyautogui.click = MagicMock() and also many other things but I really cannot find how to assert that pyautogui.click() is called once.