Dynamo Kiev took the lead from the penalty spot, but Gallas managed to score the equaliser just two minutes from full time.
He told Sky Sports 3: “It was really hard today.
“I think we played well first half and in the second we didn’t play, we didn’t defend very well and conceded the goal. I don’t know if it was a penalty or not.
“It’s not bad but we feel we could do better, we could take the full points but one point is not too bad.
“When you see you can win the game it is normal to be disappointed.
“We have to work more to be ready for the next game in three days.”
He added on scoring a goal: “I don’t feel (anything) about my goal – I just feel about the victory, I’m very disappointed, like the players and the manager.
“I scored a goal but nothing else.”