Marouane Fellaini has said he "couldn't believe" the scale of the change he experienced in the days following his 27.5 million pound summer move to Manchester United from Everton.
Fellaini, 25, joined United in the final stages of the summer transfer window, being reunited with former Everton manager David Moyes after a summer of speculation that move to Manchester was imminent.
And he told BeIN Sport he was amazed after his arrival at Old Trafford, explaining: "I couldn't believe it during my first week. It's a change, a big step. I'm training now, and starting to get used to it, but I couldn't believe it at the start."
The Belgium international also paid tribute to his former club, saying: "Everton was a family. There were good players, too. We were always aiming for the top five, and we even finished once in the top five. I learned a lot from the coach and the staff. I learn every day."
Fellaini was an unused substitute in the 3-2 win over Stoke City at Old Trafford on Saturday -- the second successive match in which he has not been used by Moyes.
His up and down start to life at United has mirrored that of the manager, and the former Standard Liege man urged critics to give both the opportunity to prove themselves.
"I know what I'm worth, the coach too. It's the coach's choice [whether or not to start him]. He's the one who makes the decisions. I don't think anything about it. It's up to me to prove that I should play," Fellaini said.
"I think he'll succeed with time. He needs time. It's all new for him and for the players. It's a new system. He's trying to continue the work of Ferguson, but it's not easy. We're not top of the league, but we're in there, we're not far off."