Watford v Arsenal - Probable lineups - Wenger facing injury crisis in defence

Sanchez was joined by key players Mesut Ozil, Alexandre Lacazette and Laurent Koscielny as Arsenal's squad were put through their paces at London Colney on Friday.

The Gunners have numerous defensive concerns ahead of Saturday's Premier League encounter, with Mustafi having picked up a long-term injury while playing for Germany while Koscielny has been out with an Achilles problem.

Arsenal's rampaging left-back Sead Kolasinac could also miss the Watford game.

Also pictured in action during the session were the likes of Alexis Sanchez and Jack Wilshere.

In-form centre-back Shkodran Mustafi has been ruled out after suffering an injury while on global duty with Germany.

Sanchez was a surprising omission from the Ballon d'Or short list for the world's best player, and as has been the case all season, rumours regarding his availability in the January window persist.

Koscielny, on the other hand, skipped the recent global break to recover from an Achilles injury that has been a long-standing issue for the France defender.

Wenger said contract talks with German worldwide Ozil, who is in the final year of his deal, were progressing well.

Wenger suggested Wilshere would continue to be involved in Arsenal matches this season and insisted that if fully fit, the midfielder will secure a place in England's squad for the World Cup in Russian Federation.

Three of them have come in the Premier League, with the draw being a very respectable 0-0 draw against Chelsea when they made a very good first of preventing the Champions from truly getting going, and in their other fixtures they managed to put aside West Brom and Brighton with a good deal of ease.

"He didn't play in the first game, and we lost him in the second game against Azerbaijan at home".

Depending on results elsewhere, an Arsenal win could see them climb as high as third in the table.

Wenger's men have tightened up at the back also, with four consecutive clean sheets since being torn apart at Anfield.