1 1 talkSPORT looks at how Manchester United could line-up with Angel Di Maria, Marcos Rojo and Arturo Vidal United fans, what do you think of this line-up? Let us know below… Manchester United have completed yet another summer signing after announcing a deal for Sporting defender Marcos Rojo. The versatile Argentinean will be a major asset to Louis van Gaal, who is struggling to field a back line composed of seasoned players at the moment.Rojo suely won’t be the last new arrival of the summer however, with United reportedly eyeing up two stars in particular. Van Gaal has acknowledged he’d love to sign Real Madrid’s Angel Di Maria in the past, while the pursuit of Juventus midfielder Arturo Vidal is no secret.With the three players mentioned above in mind, talkSPORT takes a look at how the Red Devils could line-up should all of the stars end up at Old Trafford.Rojo to rule the left?Marcos Rojo largely played at left back for Argentina at the World Cup, but when playing for Sporting on a weekly basis he tends to operate at centre back. His engine and physical strength make him an ideal candidate to occupy the left of United’s back three, while he also has experience of the role, given he has played in that system with Argentina on occasion.Di Maria the wingback?Angel Di Maria is comfortable playing in a number of positions, making his name as a winger while recently returning to the central midfielder’s role he played in his Benfica days. One position he could be particularly useful in is that of the left wing back. Under Jose Mourinho Di Maria forged a reputation for protecting the full back behind him, often tracking back into more or less the same position as the defender, so his defensive quality isn’t at doubt. Most importantly, his dribbling and crossing would provide plenty of quality at the other end of the pitch in this position.Vidal to partner Herrera?Some United fans seemed to think Ander Herrera was the answer to all of the club’s problems in midfield, but it’s fairly evident that the Basque can’t do everything on his own, and that explains the Red Devils’ continued pursuit of another midfielder in Arturo Vidal. The Chilean is a brilliant all round player, putting just as much work in off the ball as he does on it, and that would make him the ideal candidate to partner Herrera behind Juan Mata. A midfield featuring Herrera, Mata and Vidal would have bags of creativity, allowing Wayne Rooney and Robin van Persie to focus on putting the ball in the back of the net.