He said:
"I feel frustrated as we felt that we had enough chances to win the game and that's what we came here to do. We were slaughtered at Spartak Moscow a few years ago and I didn't feel we should have won that game, but tonight I have more regrets.
"The spirit in the whole squad was fantastic. The boys gave everything and I can't fault their commitment, desire or spirit, but of course they were like me in the dressing room as they are frustrated because they wanted to win the game.
"That's part of our philosophy. It's not a failure but the performance can be good and you can still be frustrated."