Brendan Rodgers has made it clear that he will quit Celtic if the Scottish club do not match his ambitions.
After watching top target John McGinn move from Hibs to Celtic, Rodgers was adamant that he will not hang around at Parkhead if the board refuse to back him over transfers.
Rodgers, who was was tentatively linked with Arsenal after Arsene Wenger announced he was leaving, is desperate to take Celtic to the next level in the Champions League.
But after already admitting his Hoops squad is weaker than last season he again stressed the importance of improving the squad.
When asked if his time at Celtic would be over if he stopped pushing for progress, he said: “Yeah. My job is done then. Terminado. Gone.
“But that’s the challenge. You have to test yourself to the limit. You have to be courageous as a club.
“It’s a joy to work here. I love my life here and enjoy being the manager here.
“But it’s no good if I just sit back and get comfortable. Being comfortable is the enemy of progress.
“I never allow it in my own life or professional life. You see it in sports and in industry. The minute you think you’re doing OK it can quickly disappear, and that’s the greatest institutions.
“You have to be mindful of that and keep getting stronger and stronger.”
Rodgers has denied a rift with the Celtic board, but there is obvious friction between the parties over investment in the squad.
He added: “Dermott (Desmond ), Peter (Lawwell) and Ian (Bankier) all want what is best for Celtic. Critically, they are major shareholders and run the club. I have to respect that, and I do.
“My ambition is for Celtic. Every manger is ambitious but for me it’s inherently about the club. We’ve done a double Treble, been invincible in one of those seasons, set a British record for unbeaten games.
“We don’t want to stand still. How do we improve? We improve in Europe and in order to do that, it’s simple, is quality players.
“The minute I start thinking otherwise and get comfortable, then progress stops. In football you can’t afford to do that.
“It’s too late once the rot sets in. It’s too late. I’ve always tried to guard against it.”