(CNN) -- Manchester United and England fans are waiting to discover the severity of an injury to star striker Wayne Rooney.
The 24-year-old will have scan on Wednesday after twisting his ankle in the closing moments of United's 2-1 defeat to Bayern Munich in the European Champions League quarterfinal first leg on Tuesday night.
Rooney, who had opened the scoring in the second minute with his 34th goal of the season, left the Allianz Arena on crutches with his right foot encased in a protective boot.
Defending English Premier League champions United face archrivals Chelsea on Saturday in a match which could determine the destination of the title. United are one point clear of the London side with six games of the season remaining.
The injury is also a worry to England coach Fabio Capello, with the World Cup in South Africa just over two months away, although United manager Alex Ferguson suggested it may not be too severe.
"He has obviously hurt his ankle," Ferguson told reporters in Germany. "It is too early to say. I don't think it's terribly serious but we'll wait and see."
English newspapers expressed their concern for the country's talisman.
"Pray" was the headline in the Sun, while the Daily Mirror went with "In Rooins." The Times described the prospect of losing Rooney as "England's Worst Nightmare."
The situation has echoes of 2006 when Rooney fractured a metatarsal bone in his right foot in April and struggled to capture top form during the World Cup in Germany that June.
Two years earlier, he had limped out of the European Championship finals with the same injury.
England have already lost David Beckham to an Achilles injury, while left-back Ashley Cole and winger Aaron Lennon are racing to be fit for England's first game against the U.S. on June 12.
Bayern gained revenge for their defeat to United in the 1999 Champions League final, with two late goals giving them a slight advantage going into the second leg next Tuesday.
Rooney's absence would boost Bayern's chances, but their coach Louis van Gaal said he hoped the injury was not too serious.
"Rooney is very important for Manchester United," he told reporters. "I hope for them that he is not seriously injured."