Key battles: Real Sociedad v Manchester United

Man Utd face a tough test in Spain. Photo: PA

Watch live on ITV: Real Sociedad v Man Utd

Manchester United look to take a giant stride towards a place in the knock-out stages of the Champions League on Tuesday when they take on Real Sociedad.

United's record in Spain is not good, with only two victories. But they can take heart from an ongoing seven-match unbeaten run, plus their opponents' failure to secure a point from their three matches in the competition so far.

Here, we highlight the battles that could determine the outcome.

Antoine Griezmann v Nemanja Vidic

Vidic has to be aware of the threat of Griezmann. Credit: PA

Griezmann was a threat at Old Trafford a fortnight ago, when he hit the post with a free-kick, and has since equalled a club record by scoring in four consecutive league games. Centre-back Vidic will have to be on his guard.

Alberto de la Bella v Antonio Valencia

Valencia has a battle on his hands. Credit: PA

Valencia is United's most solid right-sided performer and he may be required defensively tomorrow given De la Bella also fired against the woodwork in the first meeting between the sides.

Markel Bergara v Wayne Rooney

Bergara (left) is not afraid to be hands on. Credit: PA

Bergara will anchor the hosts' midfield and try to ensure Rooney has no room to exhibit his blistering early-season prowess.