Manchester United's club-record deal for Juan Mata is likely to be completed todayFormer Red Devils captain Bryan Robson was enthusiastic over the possibility of seeing the Spaniard at Old Trafford. He said: "Hopefully the signing will go through and that will give everyone a boost at the club. We need a boost. "It's not just with Mata. He's a great player. He scores goals and he creates goals. It'll give everyone a boost, but the main thing is the injury situation at the club. "Robin van Persie and Wayne Rooney are big players and you can't afford to lose players like that for a long period of time, so if United want an injection of real class within the team, those two have to come back as well. "David Moyes will have it in his mind about where to play Mata. We do need more goals from other areas besides Van Persie and Rooney. That's been proven. Also, to take possession of the ball and keep it better than we have done. "I believe that if everybody's fit and well, even if we haven't played well so far this season, the Champions League is still a realistic target. When you've got those three coming into the squad, we've got a real chance." Earlier, Arsenal manager Arsene Wenger claimed Mata's possible move to United lacks 'fairness'. Wenger believes it is unfair that Chelsea are selling Mata to United, particularly as the two clubs have played each other twice in the Premier League this season. "I am surprised. Juan Mata is a great player and they sell a great player to a direct opponent," Wenger said. "Chelsea have already played twice against Man United, they could have sold him last week. "I think if you want to respect the fairness for everybody, this should not happen. "I can understand completely what Chelsea are doing, and they do not make the rules, but maybe the rules should be a bit more adapted for fairness." Arsenal, who are two points ahead of third-placed Chelsea, could face Mata when United travel to the Emirates Stadium on February 12.