Arsenal boss Arsene Wenger has told Theo Walcott to make a decision over his position and stick to it.
Walcott is in danger of missing out on England's Euro 2016 squad if he cannot persuade Wenger to pick him for the Gunners, who are 11 points behind Premier League leaders Leicester.
The 27-year-old is Arsenal's longest-serving player but is struggling to break into the team and Wenger is unlikely to make too many changes for today's clash at sixth-placed West Ham following last week's 4-0 defeat of Watford.
Wenger explained the issue has arisen in part because, when Walcott is not selected, he wishes to play in a different position to try to feature.
"The problem with Theo is he wants to play on the right and through the middle. You have to fix yourself somewhere," Wenger said. "When he doesn't go through the middle, he thinks maybe for me it's better on the right."
Meanwhile Jack Wilshere has made his long-awaited return from injury for Arsenal's under-21s.
The 24-year-old, who has yet to figure for the Gunners this season after breaking his leg last summer, played 64 minutes of the clash with Newcastle.