Arsenal vs Manchester United - Combined XI

RB: Antonio Valencia

Valencia scored an absolute screamer against Everton earlier this season

Valencia has gone from strength to strength ever since van Gaal transformed him from winger to full back after a string of squad injuries.

He is currently one of the best right backs of the division. His unique combination of strength, defensive awareness, pace and crossing make him a nightmare to deal with, even though he's already 32 years old.

Bellerin has been decent for the Gunners so far, but this season has been far from his personal best in the Premier League.

CB: Laurent Koscielny

Arsenal v Huddersfield Town - Premier League

Koscielny has been his usual calm and composed presence at the back for Arsenal so far this season, adapting well to their 3 at the back formation.

At the age of 32, he's still an uncontested starter for the Gunners. If Eric Bailly was fit, he might have a slight edge over the Frenchman, but that takes nothing away from Koscielny's importance for his team.

Rob Holding provided a younger and fresher option for Wenger when he signed for Arsenal last season, but he will still have a lot of work to do if he is to oust Koscielny from the first team.

CB: Marcos Rojo

Rojo returned to the starting XI against Watford in midweek

Rojo's injury kept him out of the squad for a large part of the season, but his return has given Mourinho a very valuable option at the back after injuries to Jones and Bailly.

The Argentine was solid during the matches against Basel and Watford, and showed no signs of his cruciate ligament injury holding him back.

He's almost certain to start against Arsenal today, but it remains to be seen whether Mourinho goes with a four or three man defence.

LB: Sead Kolasinac

Kolasinac in action against Huddersfield

Some Arsenal fans might be dreading having to face Ashley Young today, given his stunning performance in *that* 8-2 demolition six years ago, especially considering the incredible form his is in right now.

But Young isn't a true fullback, and Kolasinac is proving to be a bargain following his performances for the Gunners after arriving from Schalke on a free.

Kolasinac has played in 13 of 14 matches so far this season, and already has 4 assists and 1 goal in the league. He's quite solid defensively, and has a bulky physique that enables him to physically dominate his opponents.