The Celtic coach announced in an interview with Daily Record, that he wants to spend to spend a ot of money for making his club more competetive.
"I have never been given a ceiling but I won't bring anyone in for the sake of it.
"We need players who want to take Celtic forward. Whether they are a million quid, £6m, £7m or whatever, the club know I will bring that to them.
"You want to keep a cohesive group, a tight-knit squad, you want to pay players what they are worth. Sometimes the market, depending on where you get them from, can be over-inflated.
"But if a player we feel is worth it, I will always look to convince the board that we can do that because the Celtic supporters deserve the best players.
"We've had players offered here who might sound great in terms of names but they aren't going to help Celtic.
"I need players who are coachable, who are hungry and have quality, whether they are experienced or not," the coach said.