Gylfi Sigurdsson says new Everton boss Sam Allardyce has given the club "a little bit of spark" before the Merseyside derby on Sunday.

"You're speaking to someone from Iceland where you're the underdog in every game for your national team," Sigurdsson told BBC's Football Focus. "I personally know anything is possible."

"Sam's been good. Very direct.

"We know what he wants and he explains it very well. He looks after the players very well to get the best out of them. He's very experienced and I think that will benefit us."

"We're all used to being in the position where we change a manager and wait to get a permanent manager," added Sigurdsson. "For us as players it's quite simple.

"It would be an easy excuse for us to try and use that. It does tend to happen that when you get someone in something happens. A little bit of spark."