United were frequently linked with the 25 year old whilst he was at Standard Liege, with Sir Alex Ferguson going as far as to send him a personal letter wishing him the best when he was ruled out of first team action with a broken leg.
Defour left Liege in 2011, joining Porto for €6m with United choosing not to challenge the Portuguese club, but it appears that Moyes will return to Defour as he looks to bolster his midfield.
Moyes himself attempted to add Defour to his side whilst at Everton having previously signed Marouane Fellaini from the side also known as the Red Devils, and could reunite the international team mates at Old Trafford.
Sporting Witness have highlighted a number of instances where United are said to have watched him and they will undoubtedly have had eyes on him tonight as Belgium lost 2-0 to Columbia, as well as in their tie with Japan in a few days.
Another interesting point that could be a factor in the transfer is Anderson. Porto are clearly interested in their former player and he has been touted as a makeweight in a number of United/Porto deals. Clearly out of favour at Old Trafford, could Moyes kill two birds with one stone and ship him out in favour of Defour?