#INSERT type:image caption:Romelu Lukaku scored Everton's controversial opening goal. END#
West Ham manager Sam Allardyce said was "baffled" by the decision that gave Everton their opening goal in the 2-1 win at Goodison Park.
Even a postmatch explanation from referee Mark Clattenburg as to why Romelu Lukaku's strike was allowed to stand despite him being offside immediately before Ross Barkley's shot rebounded to him failed to appease the Hammers boss, who will be taking up the matter with officials' chief Mike Riley next week.
"A little bit of it was our fault but that decision baffled me so we have to be frustrated," said Allardyce.
"The first shot was blocked by Winston Reid and it falls to Lukaku who is two yards offside.
"For me there will be some way forward next week for an explanation. I have had an explanation from the referee but I won't discuss that publicly, I'll discuss it privately with the PGMOL [Professional Game Match Officials Limited] next week.''
After a couple of meaty challenges from James McCarthy -- who provoked a melee after going over the top on Morgan Amalfitano -- and Steven Naismith, Allardyce claimed the Hammers asked Clattenburg for greater protection.
"I think they were yellow cards. Naismith's challenge on Mark Noble was probably the worst of all and because there wasn't a furore it went unnoticed," he added.
"Noble ended up coming up off injured because of that. They showed a certain degree of physicality and we had to ask the referee to protect us, and I don't think he did that too well.
"It is a part of the game we accept, but the most frustrating thing is our controllables.
"We have been very good this year at converting chances with very good delivery in the final third, but our finishing was not good enough. Because of that we have ended up losing and a referee's decision has contributed to it."
Everton manager Roberto Martinez was delighted with the way his team bounced back to secure victory.
"That is the most satisfying win we have had this season, although you will see games that are more glamorous," he said.
"You know you have been in a game, it is one of those wins you get through character, personality, winning mentality, and that gives me a real satisfaction."
He praised the contribution of Leon Osman, who hit the winner after Mauro Zarate had equalised, saying: "I thought he was outstanding throughout the game.
"He is a great ambassador for our football club."