Arsene Wenger has confirmed Alex Oxlade-Chamberlain will miss up to four weeks with a hamstring injury . As Sportsmail revealed on Tuesday , Oxlade-Chamberlain will miss a clutch of Arsenal 's fixtures - including next week 's Champions League clash against Monaco - after suffering a hamstring strain in Monday 's win over Manchester United . Speaking ahead of Arsenal 's Premier League clash against West Ham , Wenger said : 'It 's a hamstring injury . He 'll be out for three to four weeks . Arsene Wenger has confirmed that Alex Oxlade-Chamberlain will be out of action for 'three to four weeks ' Oxlade-Chamberlain suffered a hamstring injury during Arsenal 's 2-1 FA Cup win against Manchester United . 'It 's frustrating for him but he 's played more games this season than before . He 's shown his importance . ' The Gunners star will also be unavailable for England 's double-header against Lithuania and Italy at the end of the month . Wenger also confirmed Jack Wilshere , who is recovering from ankle injury , will not be available for Roy Hodgson to pick next week . He added : 'It 's very difficult to say when he ( Wilshere ) will be back . We have to respect his recovery . ' Meanwhile , Wenger has confirmed Hector Bellerin is in line to sign a new long-term contract at the Emirates Stadium , as Sportsmail revealed on Thursday . The 21-year-old midfielder has 'shown his importance ' to the team , believes the Arsenal boss . Wenger was unable to put a time frame on Jack Wilshere 's ( right ) return to action . The French boss also confirmed Hector Bellerin ( right ) is in line to sign a new long-term contract . Club captain Mikel Arteta is set to resume full training following an ankle injury suffered at the end of November , and is expected to be in contention again at the start of April . Arteta , 32 , is out of contract in the summer , and is expected to agree a one-year extension . 'Normally I would like him to stay on , yes . He has a huge experience and is very important in the squad , ' said Wenger , who also confirmed full-back Hector Bellerin was set for a new long-term deal . Arsenal can cement their place in the top four of the Barclays Premier League with victory over West Ham , who have slipped down to mid-table . Mikel Arteta is set to resume full training following an ankle injury suffered at the end of November . 'The mood is good as you can imagine , but focused as well because we know that every single game is a decisive game now , said Wenger , whose side head to Monaco next week looking to overturn a 3-1 first leg deficit . 'Every year it ( making the top four ) gets more difficult because you have more teams who can compete for it , and in future years it will be even harder . 'It is an important part to have a good mixture between focus and composure , that is not easy to find because the tension can be too big . '
Arsene also reveals Alex Oxlade - Chamberlain will miss ' three to four weeks ' with hamstring injury . Oxlade - Chamberlain suffered a hamstring injury during FA league clash against Manchester United . Wenger also confirms Jack Wilshere is still unavailable for selection . Arsenal face Premier League clash against West Ham United on Saturday . READ : Arsenal : Mesut Ozil , Olivier Giroud and sports talk fashion . com HERE for all the latest Arsenal news .