The midfielder, who captained England in their last game against the Netherlands in February, has an Achilles injury.
Harry Redknapp: "He's had a problem with his Achilles, I hope it's not going to get worse. It isn't getting any better. It's a long-term concern.
"The way he is at the moment, he is struggling for fitness.
"It's not a rupture but it is sore. It is bothering him.
"After tomorrow he will have some injections in it and we'll see if that can clear it up.
"He's been carrying it a few weeks. Maybe the only cure is a bit of rest but maybe the injections might clear it up.
"The specialist thinks it will clear up but it will need 10 days' rest afterwards."