New Leicester City boss Brendan Rodgers says he understands why Celtic fans are so angry with his exit.
Rodgers, 46, quit Parkhead on Tuesday to replace Claude Puel on a three-and-half year deal.
A banner unveiled during Celtic's 2-1 win at Hearts in midweek called Rodgers a fraud, saying he had swapped immortality for mediocrity with the Foxes.
An online video also showed Hoops fans chanting abuse at their old manager.
"I've seen what's been said but Celtic supporters will hurt. I understand how they feel," said Rodgers. "They are, maybe, worried in terms of what might happen with me leaving.
"They gave me everything so I'm not going to say anything other than that.
"It may be a little unfair on Leicester, I haven't swapped coming into a mediocre club.
"It's recent history has been incredible, they have that ambition to push higher than where we are."
Rodgers takes over with Leicester tenth ahead of tomorrow's trip to old club Watford.
"The expectancy is to challenge for a European place and win a trophy," he said.
"What Leicester achieved is one of the most incredible sporting stories. That will always be difficult to repeat.
"After a few years of instability and sitting mid- table, the plan is to move up."
Rodgers is also keen to help vice-chairman Aiyawatt Srivaddhanaprabha after his father and Leicester owner Vichai died, along with four others, in a helicopter crash at the stadium in October.
"I feel I can help him on his journey,'' added Rodgers. For the first time he has made decisions without his father and has been so courageous.''