New Sunderland manager Chris Coleman has vowed to get rid of players he feels lack the commitment to help the club.
Coleman, 47, left his job as Wales boss to sign a two-and-a-half-year deal to succeed the sacked Simon Grayson.
He admits it is a “daunting task” with Sunderland bottom of the Championship.
“If you’re committed you’re in, if not you’re out,” said the former Fulham boss. “You can’t pretend at it. What we don’t need are any shrinking violets.”
He added: “We will find out who is going to be coming along on this next chapter pretty quickly I think. Whoever is not will need to go and play football somewhere else.
“If this challenge is too big for them then they need to move on. When it turns it will be hard to stop’
Coleman is Sunderland’s 10th permanent manager since Roy Keane’s exit in December 2008 and he will be joined at the Stadium of Light by Kit Symons, who was his assistant at Wales.
He says friends in the game told him not to visit the club’s training ground and stadium until he was sure about taking the job to prevent the high-quality facilities from swaying his judgement.
But he inherits a club that were relegated from the Premier League last season and set an English football record of 20 successive home games without a win following Saturday’s 2-2 draw with Millwall.
“Nothing good ever came from a comfort zone and I know I’m in no comfort zone at Sunderland,” added Coleman, who will take charge of Tuesday’s trip to Aston Villa.
“Someone will turn this club around, whether it is me or the next one. I want that to be me, of course.
“You can go through a career as a manager and never manage a big club. I always wanted that experience and here I am. We are bottom of the league, that’s reality. It’s still a big club, still Sunderland.
“It is going to be a big challenge. I am going to need all the supporters, players, staff, everybody to come with me on this.
“Sooner or later it will start turning. Then it is such a big club that when we gather momentum, it’s hard to stop.”