The Argentina international has been with the squad for the past few weeks, but he has not made his return to the first team just yet.
He only has four appearances for United all season. And Rojo has issued a plea to his manager that he can fill in where needed to the end of the season.
"It (left-back) is a position that I know very well," Rojo told manutd.com.
"I've played there many times for the national team, in fact I almost always play in that position for Argentina.
"I've also been asked to play there in a few games for United, so it's a role that I know pretty well so I'm ready for whenever the manager needs me, whether it's in the middle or at full-back.
"I just want to play so I'm ready and willing to help out the team."