Mikael Lustig reckons Celtic should have shown more respect in their efforts to keep him this summer.
And in a wide-ranging interview the Swedish defender has taken aim at former Hoops boss Brendan Rodgers over the timing of his departure from the champions.
Lustig won an incredible 16 trophies at Parkhead in a eight-year spell with the Parkhead side.
But the Sweden international, 32, opted to leave this summer to forge a new career at ambitious Belgian side Gent.
And Lustig admits he wasn't happy with the terms offered by Celtic, with only a one-year deal reportedly on the table, compared to the three years he got at Gent.
Lustig said: "Celtic will always have a huge place in my heart, but in football, we are not always alone in deciding.
"They offered to keep me on and, come on, I respect the club too much to say bad things about it.
"But I gave everything to them for eight years...I was expecting a little more respect in return.
"My family and my ex-teammates know what happened, that's the most important thing.
"And I do not want to close this door, I want to feel good when I return to Glasgow."
Lustig, in an interview with Sport/Foot Magazine in Belgium, insists he has no regrets about moving to a relatively modest club in comparison with Celtic.
And while he relished every one of his eight league titles, he admitted it got more difficult each year - especially after the departure of former boss Rodgers.
Rodgers shocked Scottish football when he walked out to take over at Leicester in February - with the Hoops hunting down the treble Treble.
And Lustig said: "At Celtic, we knew at the start of every season we had a good chance of being champion, but to do it for eight years in a row wasn't easy. Every year it was more difficult.
"I truly hope Celtic will reach the ten-in-a-row with all my heart.
"For me, the most special title was last season because we won the treble for the third time in a row, which had never happened in Scotland.
"But I'm not a trophy collector - the most important thing was not the trophies but the recognition of people.
"In terms of managers, Neil Lennon persuaded me to move to Celtic so he is the most important coach for me.
"Tactically, the best was Brendan Rodgers...a true perfectionist.
"I only regret that he left the way he did. When you say you are a fan of Celtic you do not quit the club in February.
"I do not approve of his choice and he knows it."
