Manchester United have not made an official approach for Olympiakos defender Vasilis Torosidis, according to the player's agent.

The versatile 26-year-old is believed to be on Manchester United's radar amid reports Sir Alex Ferguson is considering a move for the experienced Greek international in a bid to alleviate the injury problems his defence has perpetually encountered this season.

Last week the Daily Mail claimed scouts from Manchester United watched Torosidis in action during Olympiakos' 0-0 draw against Doxa Drama and while the player's agent, George Kazianis, refused to confirm or deny the Premier League champions were interested in the defender, he told The International Business Times that there had been no official approach.

"I would like to inform you that I have no official proposal from Manchester United regarding the player Vasilis Torosidis." Kazianis told The IBTimes UK.

Manchester United have endured a torrid season with injuries to date, that has at times decimated their back-line. The long-term absence of captain Nemanja Vidic has exasperated United's problems, but Chris Smalling, Phil Jones, Rio Ferdinand and the Da Silva twins have also all faced spells on the sidelines this term.

Torosidis is believed to have a £6 million buy-out clause should Manchester United decide to firm up their reported interest in the robust defender. With 42 caps for Greece and plenty of Champions League experience, the 6ft 1inch fullback has the necessary quality to provide defensive cover in a number of positions in Ferguson's back-line

The 2010 Greek Footballer of the Year is a right-back by trade but equally adept anywhere across the back-four, and has in the past been associated with moves to Liverpool, Newcastle and Bayern Munich.

While Manchester United have been associated with defensive cover in the January transfer window, the club's record signing, Dimitar Berbatov, is reportedly considering a return to the Bundesliga.

At the beginning of the month Sir Alex Ferguson confirmed the club's intention to exercise the Bulgarian's one-year contract extension in March, but the 30-year-old is wanted by his former club Bayer Leverkusen, and has also been coveted by Bayern Munich and wealthy Russian club Anzhi Makhachlala.