Everton manager David Moyes was furious after another poor challenge injured one of his key players.

South Africa international Steven Pienaar was stretchered off with a knee injury during the clash with Portsmouth after a harsh challenge by Aaron Mokoena and Moyes wants more protection from referees after already losing Phil Neville, Phil Jagielka, Mikel Arteta and Victor Anichebe all to knee injuries.

"It's another late challenge," said Moyes.

"It's one of these late challenges which I'm sure will be picked up by the referee. We lost a player the other week against Fulham and now we may have lost another one.

"Before you know it they're going to be taking all of our players out if the incidents are not picked up on."