Arsenal manager Arsene Wenger is unsure that former charge Kieran Gibbs will get his desired improvement after leaving Arsenal for West Brom.
Gibbs returns to the Emirates on Monday night for the first time as a Baggy.
'Once someone takes the decision to leave I wish them well and focus on my squad, but just look at the performances of the players who left us and then come back to me about it,' said Wenger.
'Learning is an attitude in life. It doesn't depend on your geographical status, but more of the attitude in your brain.