Veteran keeper Jens Lehmann played in every one of Arsenal's 38-match unbeaten run to the title in 2003/2004 as well as lifting the 2005 FA Cup and helping the team reach the Champions League final in the following season.
The 41-year-old has rejoined his old club on a short-term monthly rolling contract as the Gunners battle a keeper crisis at the Emirates.
And the former German international hopes his experience will enable the Gunners to end the season strongly.
"I have got that - in terms of experience, I am still good, so I need to give that onto the young lads," Lehmann told Arsenal TV Online.
"I hope we will be successful in getting the trophy, to give that extra bit of conviction to the players - that is why I am here and why the boss has asked me to come."
Lehmann had retired following two seasons back in Germany with Stuttgart, and was working as a media pundit in the Nou Camp.
"When Szczesny went out, I crossed my fingers for Manuel to do well, and he had a great game, but it never occurred to me that there was a lack of goalkeepers which could end with a request for me," said the German, who had been lined up to work with Arsenal reserves this month as he started on his coaching badges.
"I got a text when I got back from Barcelona, it was (goalkeeper coach) Gerry Peyton and at first I did not recognise it because I was very tired, then on the second text I realised he wanted me to get my gloves out again.
"Later Arsene Wenger called me to ask if I was available, and I said 'let me talk to my wife' - now I am here.
"I am happy about it, for an exciting finish of my career and I will try to get the best out of it."