Jimmy Bullard revealed his “regret” for not taking up the option to sign for Celtic back in 2010.
The former Fulham and Wigan midfielder was close to joining the Parkhead club on loan from Hull City.
However, the potential move fell through when the player decided to stay put before eventually leaving to join Ipswich the next year.
Bullard was in Glasgow last week to take part in Soccer Am’s You Know The Drill challenge where he squared off against Hoops striker Leigh Griffiths.
Afterwards he spoke to Celtic TV, saying: “I had a lot of things going on. My missus was pregnant at the time and, you know what they’re like, in your earhole.
“It was a loan deal so it was quite a difficult deal to get done and, to be fair, it was one of them where, at the time, it didn’t really suit me. I had a load of difficult things going on.
“But now, coming out here, I’m gutted – it’s probably my only regret in football because I’d have loved to play here.
“Lenny was here at the time, he’s a great man. I went up to Bolton to see Lenny and we did a You Know the Drill with him.
“I was just gutted. Now, some nights I’ll go to bed, to all you Celtic fans, and I do regret not signing.”