Manchester United had reportedly hoped to recruit Nicolas Otamendi from Porto before last Friday's transfer deadline, and the failure of the Premier League champions to conclude a deal has seemingly had a sizeable affect on the defender.
It was claimed the Red Devils submitted a formal offer of £12.3 million in the hope of recruiting Otamendi, but their attempts to prise the Argentina international away from the Estádio do Dragão proved fruitless.
Otamendi was also wanted by Valencia and, according to Portuguese newspaper A Bola, the collapse of a proposed transfer to either Old Trafford or the Mestalla, has placed the player in a fragile nervous state.
Issues regarding his passport are reported to have played a direct role in the transfers falling through and Otamendi is supposed to be on the verge of a breakdown after failing to secure the move he seemingly desired.
He could still pursue a move to Turkey or Russia with both transfer markets still open, with Zenit St Petersburg a potential destination, although the possibility that he could wait until the summer to pursue a move to Manchester United.
David Moyes has been linked with a number of potential recruits at centre-back, and Otamendi represents a cheaper alternative to his clubmate Eliaquim Mangala.