City captain Vincent Kompany, meanwhile, said he had never seen anything like Kepa's refusal to go off, but was glad not to face Willy Caballero in the shootout.
'I know how good Willy is on penalties, when we won this competition against Liverpool he was tremendous, he won the penalties for us and it would be another mind game to be played,' he told Sky Sports.
'It didn't happen and the confidence was there to score the penalties. Of course I've never seen anything like it. I wish I could do it every now and then when I don't want to get subbed off!'