Bacary Sagna admits the Arsenal players are still haunted by the manner of their Champions League semi-final exit to Manchester United last season - but feels the experience can help them go all the way in Europe this term.
The Gunners, who host Olympiacos in their second Group H match on Tuesday night, failed to perform during the first leg at Old Trafford, but escaped with only a 1-0 defeat.
But a slip by young defender Kieran Gibbs handed United an early away goal in the second leg which all but killed off the tie, United going on to win the game 3-1.
Full-back Sagna, 26, believes those "bad experiences" can only serve the squad well as they bid to reach the 2010 final in Madrid.
"We knew we had the quality to play the final last year, but we didn't play our own game," he said.
"Against Manchester United we have some regrets and this year we want to give everything and go until the end. After the game we were still thinking about what might have been. This year we have to think about last year to improve and go forward. We are all looking forward."