When asked about the issue on Friday, City manager Mancini appeared to lend credence to Capello's view that Richards still struggles with his concentration during games.
Mancini said: "Micah is young. In the last year he improved a lot as a player but I think he needs to improve more. He has good quality but sometimes Micah is too strong and he thinks he can play at 50 per cent.
"If Micah plays to 100 per cent, for me he can become one of the top full-backs in Europe.
"With Micah, his body is on the pitch but his mind is left at home sometimes.
"For this, he can improve - if he can remember to pick up his brain. I say this because I love Micah, like all the players do, and I don't think Micah can lose time because he has everything."