Reports claim that the midfielder linked up with the Portuguese outfit in a late deal, although the transfer is yet to be confirmed by either club.
Outlets including the Daily Star and O Jogo believe that Rodriguez's move has indeed gone through, but Chelsea's official website says otherwise.
The Colombia U20 international was on loan at French club Bastia for the first half of the season, but his temporary stay is believed to have been cut short by former Blues hero Claude Makelele.
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Joao Rodriguez's current status at Chelsea is unknown
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However, Chelsea's loan list maintains that the player is still with Bastia, and makes no mention of any termination or move to Portugal.
Jose Mourinho is apparently a big fan of the forward, and the Star adds that he wants Rodriguez to gain more playing time in a bid to boost his development.
Indeed, if the youngster has joined Guimaraes until the end of the season, he will be one of 30 loanees currently plying their trade away from Stamford Bridge.