Maicon would fill a need at right-back but is past his best and getting up there in age. At this point in his career it is hard to say he would be a bigger improvement over Alvaro Arbeloa.
Modric is one of the most sought-after players this summer, and for good reason, but he would hardly find a spot in this Madrid team.
He would not displace Xabi Alonso or Mesut Ozil despite his playmaking traits, and he would not displace Sami Khedira as the more defensive midfielder in the teams usual 4-2-3-1 formation.
Carlos Tevez is another player that has been linked to the club, and he would be a great fit. According the Daily Mail, Tevez could be sold in order for Robert Mancini to get funds for a potential run at Arsenal's Robin Van Persie. Tevez's energy and versatility would be a great help to Real Madrid next season.
The major worry for fans would be the problems Tevez had with Robert Mancini and Manchester City during the last year. With Jose Mourinho in charge, there would be no such discipline issues, and the Portuguese manager would get the best out of the Argentine attacker in the process.
Another positive, where his character is concerned, is that Tevez would be joining fellow Argentina teammates Gonzalo Higuain and Angel Di Maria. That would certainly help with his integration into the squad.
One more positive for Real Madrid in this move is their location. Being that homesickness was one of the reasons that Tevez was disgruntled, a job in the Spanish capital would, hopefully, make him feel a lot more relaxed; Spain is much closer, culturally, to Argentina than Manchester.
Tevez has been a winner during his time in England, except for his time at West Ham, and a new challenge would suit him. The time he has spent with Manchester City thus far is equal to his time at West Ham and Manchester United combined, and he could still be ready to move on.
Looking at what he could bring to the club on the field, there are a lot of positives. We already mentioned the fact that he knows both Higuain and Di Maria, but Tevez has also spent time on the pitch with a certain Cristiano Ronaldo.
The duo, along with Wayne Rooney, helped Manchester United win the Premier League in 2007-08 and 2008-09 before they both departed. Tevez for Manchester City and Ronaldo for Real Madrid.
The fact that Tevez would not need too much of an introduction to Ronaldo would certainly help things as well. On top of that, Tevez would give the club one more world-class forward, a solid player on either wing and an adequate replacement to play behind the forward, as well.
In short, Tevez alone adds some great depth to the Real Madrid attack.
For many, the possibility of this deal is an unknown, but one thing is certain: Tevez would be a great addition to the club for all of the above reasons.