Roy Hodgson is unsure whether Danny Welbeck and Daniel Sturridge will feature for England at Euro 2016.
Welbeck underwent surgery on his left knee last week after struggling to progress in his rehabilitation following an injury last season and is expected to be out for "a period of months".
The 24-year-old has not made an appearance for the Gunners this season and his last match for England came in March in the 4-0 win over Lithuania.
Sturridge has been plagued by injuries for the past year and has not featured for Liverpool this season. His last appearance for England came back in September 2014 against Norway.
Hodgson remains keen on them being fit but is prepared to look elsewhere and has demonstrated his willingness to do so by including Leicester City's Jamie Vardy and Tottenham's Harry Kane in his latest squad.
"Well, Welbeck bothers me now. He has already been out for me since March and for Arsenal since April, and now I hear it's another six months," Hodgson told several national newspapers.
"I can only hope that Danny recovers a bit quicker and then hits the ground running."
Hodgson added: "Daniel is a bit the same. It's getting on for a year now [since he played for England].
"They are always in my thoughts because I think they're very good players and they did extremely well when they were playing in the national team I was coaching.
"I've got to make certain that there are a few Vardys and Kanes and Walcotts, because we can't keep going around talking about the ones who aren't there."