Romelu Lukaku scored the winning goal on his Everton debut at West Ham United on Saturday, but admitted afterwards that he could not remember anything about it.

A loan signing from Chelsea, the Belgian striker came on as a half-time substitute at Upton Park and claimed the decisive goal in a 3-2 win with a brave 85th-minute header.

However, he collided with West Ham's Joey O'Brien in the act of scoring and required lengthy treatment on the pitch before groggily continuing.

"I remember nothing about it," Lukaku admitted.

"I did not even know I had scored. That was the first thing I asked the doc. I said, 'Who scored?' He said, 'You.'"

West Ham twice took the lead in the Premier League encounter, only for Leighton Baines to reply on each occasion with a pair of superb free-kicks before Lukaku's dramatic late intervention.

"It's great to see a young footballer with old-fashioned attributes to be a winner," said Everton manager Roberto Martinez of Lukaku.

"His link-up play was magnificent in the winning goal. He gets himself where it really hurts. That was a key moment and showed where he can be a key player for us. He can be very special for us."