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The eagle-eyed Blues fan says he found the strip on the sportswear giant’s UK store online, but it was quickly removed.
Could this mean the Leicester ace is on his way to Stamford Bridge?
Adidas seemed to make a similar mistake ahead of Henrikh Mkhitaryan’s transfer to Manchester United.
The kit supplier appeared to be selling away shirts with his name on the Red Devils’ official website.
Arsenal were thought to have been leading the race for Mahrez, having singled him out as a key transfer target.