Si Ferry has revealed the one player he still cannot believe couldn't earn himself a deal after a trial at Celtic.

The midfielder was a youth ace at Parkhead when Spaniard Iván de la Peña was looking to make a mark for manager Martin O'Neill and land a contract.

De la Peña, formerly of Espanyol, Barcelona and Lazio, had Ferry and his fellow youngsters sprinting to watch him in training with the first-team. And the Peterhead ace still can't believe O'Neill didn't sign him.

Speaking on Open Goal, Ferry said: "I first went to Celtic, the best trialist I've ever seen in my life, I can't believe he never got a deal, de la Peña. He was f***ing brilliant. We used to run up from youth team training to watch the first-team, to watch him train. Never got a deal.

Glasgow Times: De la Pena in action for CelticDe la Pena in action for Celtic

"You know when someone never passes with the inside of the foot? He was just schmingin'(sic) it everywhere, man, with his laces. He wasn't really a Martin O'Neill type player, a central midfielder. Ability wise though, oh my God. He played for Spain a few times, and Barca."