LONDON (Reuters) - Manchester United striker Wayne Rooney has suffered a head injury during training and is doubtful for Sunday's English Premier League clash with bitter rivals Liverpool, according to British media reports.

Rooney suffered a deep gash in his forehead during a collision with a teammate at the club's Carrington base on Saturday and needed stitches, the Sunday Mirror reported.

The injury could also see the 27-year-old striker miss England's upcoming crucial World Cup qualifiers against Moldova and Ukraine, the paper said.

England face Moldova at Wembley on Sept 6 before travelling to Kiev to play Ukraine on Sept 10.