Swedish striker John Guidetti has accused Celtic of being "nasty" to him during his time in Glasgow.
Guidetti proved an instant hit when he arrived on loan from Manchester City in 2014, but his goals dried up and he rejected an offer from Celtic to make the deal permanent.
He then had a tantrum in the League Cup Final win against Dundee United when he wasn't allowed to take a late penalty – which was subsequently missed by James Forrest – and had to be persuaded to join the celebrations after the game.
He eventually signed for Celta Vigo and is now with Alaves in La Liga .
But Guidetti still has regrets over the way it ended for him at Celtic .
He said: "In my loan spell at Celtic, the club played a nasty game with me.
"In the winter, the club management offered me a contract, but I declined that.
"The Scottish league was good for me to get fully fit, but my goal was always to play in England or Spain because I consider those two competitions to be the best in the world.
"Because of that, at Celtic I ended up in the stands.
"It was a real pity because Celtic are a terrific club and their fans deserved a better farewell from me."
