Pedro Rodriguez decided against a move to Manchester United after Louis van Gaal's "unfair" treatment of Victor Valdes left the winger unhappy.
A report in The Mirror claims that Pedro took exception to Van Gaal's decision to publicly criticise his long-time friend and throw him out of the first-team.
Valdes has only been at Old Trafford fox six months, but is available for transfer after the Dutchman accused him of refusing to play in an Under-21 fixture, something the former Barcelona star denies.
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Pedro's representatives have made their concerns over the way Valdes was treated by Van Gaal and is believed to have left the 28-year-old in two minds over a transfer deal.
With those concerns in mind, when Chelsea finally came in with an offer Pedro's mind was immediately made up. He would improve to play under Jose Mourinho at Stamford Bridge and is set to complete a move to London soon.
Manchester United have moved quick to claim that it was they who pulled out of negotiations, but after weeks of haggling with the La Liga club, it sounds like an uneasy attempt to save face.
Chelsea have reportedly met Barcelona €30million asking price on Wednesday morning and are now the frontrunners to seal Pedro's signature.
The move comes as a reaction to their poor start to the season. A draw against Swansea and a 3-0 defeat to Manchester City has already placed a Premier League title defence in doubt.
They are also considering a £40m bid for Everton defender John Stones after seeing their £30m bid rejected.