The Dutchman passed a late fitness test in order to start against Dynamo, netting the stoppage-time goal that secured a 2-1 victory.
“I had a problem, but I was 100 per cent before the game and had a heavy job to do,” he told Sky Italia television.
“You never expect to be the man of the match. The first half was a bit difficult for us, but we started playing football in the second and really deserved to win.”
This was not only the Nerazzurri’s first Champions League victory of the season, but their first since October 2008.
He added: “It was very important to win here, as now we have six points are top in the group and can go to Barcelona knowing they have the pressure on them, so we can play our game.
“We are first and everything is in our hands.”