Gareth Southgate admitted his disappointment at seeing Phil Jones withdrawn from the England squad.
The Manchester United defender has pulled out of Wednesday night's friendly with Germany and Sunday's World Cup qualifier with Lithuania after picking up a knock on training on Tuesday.
Manager Southgate said of the innocuous incident: "I don't know who it was with. It was just a tackle, a nothing sort of thing really.
"It is very unfortunate for him and a huge disappointment because he has been playing very well and he has had some injury difficulties in the past.
"Hopefully it is not too serious, but it needs to be checked out."