Jens Lehmann has blamed a Nike football for Arsenal's Champions League defeat to Chelsea during the Gunners' historic Invincibles campaign.
Arsene Wenger's side were dominant during the 2003/4 season, not losing a single game as they finished 11 points clear at the top of the Premier League table.
But their dreams of more silverware that season were ended by their biggest domestic rivals - with Manchester United knocking them out of the FA Cup and Chelsea ending their Champions League dream in an all-English quarter-final tie.
The latter was perhaps the biggest missed opportunity, with Arsenal well poised after a 1-1 draw in the first leg at Stamford Bridge.
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