English Premier League contenders Chelsea have furthered their interest to sign Inter Milan midfielder Fredy Guarin by making an official bid to the Serie A club.

Reports indicate that Manchester United is keen on bringing the Colombian to Old Trafford to improve its personnel in the middle of the park.

The Red Devils have sent out representatives to Italy to try to sort out a deal, but the Blues came up with an excellent countermove by making an irrevocable offer.

Sources state that Chelsea made a bid of £10million plus £5million worth in bonuses, which Inter are currently considering and reviewing.

The 27-year-old box-to-box midfielder could provide the needed strength, literally, in any team that he may be sold to.

Chelsea boss Jose Mourinho has reiterated his stance on not spending in the January transfer window, but the tight race for the League title could see him make a surprising move.

United have yet to take action on Chelsea's offer, but a persistent Moyes see him retaliate in no time.

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