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Fabio da Silva is first on the list to replace Patrice Evra at left back if Manchester United promote from within.
While his twin brother Rafael has already been heavily involved in the first team at right back, Fabio has struggled to get into the team.
In four seasons at Old Trafford, Fabio has made just 50 appearances for the club. This is primarily due to his susceptibility to injury. Much of his time in England has been spent in the treatment room, and that hindered his chances to fully establish himself in the first team.
Despite the injuries, however, Fabio has played in big games for United. With his brother sidelined by injury last season, Fabio regularly played at right back during the final months of the 2010/11 season. His performances deputizing for his brother ultimately earned him a spot against Barcelona in the 2011 Champions League Final.
Fabio still has plenty of room to improve defensively, but time in the first team should encourage that development. Although Fabio still has some shortcomings as a defender, given some of Evra's performances this season, it's hard to imagine Fabio could do any worse.
He provides an attacking threat from the left back position. As is common among Brazilian full-backs, Fabio is excellent going forward and has even featured for United as a winger on occasion.
However, United supporters are concerned with Fabio's endurance and recklessness. The 21-year-old rarely lasts a full 90 minutes and is prone to poor tackles, resulting in discipline or self-induced injuries.
With the January transfer window recently closing, Sir Alex Ferguson will have to make due with what he has. If Evra is rightfully dropped, then Fabio must surely be first in line to replace him.