England striker Michael Owen is almost certainly out of the World Cup.
The 26-year-old twisted his right knee as he played a pass to Ashley Cole in the first minute of England's 2-2 draw with Sweden in Cologne on Tuesday.
Sven-Goran Eriksson said after the game: "Maybe he's out of the tournament, I'm not sure. It doesn't look good at all."
An England source told BBC Sport Owen would miss the rest of the tournament as the injury was "very serious".
owen will have a scan at England's Baden-Baden base camp on Wednesday, having flown back there from Cologne with the rest of the squad overnight.
England skipper David Beckham admitted he thought Owen's injury was serious.
"I think it's a bad one," he said. "We are going to have to wait to see what the doctors say tomorrow.
"It's sad - Michael's one of those players you need in big tournaments. It's unfortunate for him and for us."
Former England captain Alan Shearer, who played with Owen at Newcastle last season, told Match of the Day on Tuesday night: "I have had a text from him. He's in a lot of pain and he hopes it's not bad."
Owen, who was winning his 80th cap, crawled off the pitch as soon as he hit the ground, suggesting he knew something was seriously wrong.
Ice was put on the knee and a brace was later applied.