Man City defender Richards urges Boyata not to dwell on red card
Boyata, 19, saw red for a foul on Marouane Chamakh and left City facing an uphill task.
Richards said: "Dedryck just mistimed the tackle, there was no malice in it.
"He can look at Sunday's bench and be proud he got selected ahead of some experienced players. He can be a top defender.
"Everything is coming together nicely in the Premier League and in the Europa League."