The Chilean forward looked a little rusty when he came on after 67 minutes in Saturday 's goalless FA Cup fifth - round tie with Hull City .
Wenger was confident he would be ready for the Champions League first leg against his old club .
The Chilean forward looked a little rusty when he came on after 67 minutes in Saturday 's goalless FA Cup fifth - round tie with Hull City , but Wenger was confident he would be ready for the Champions League first leg against his old club .