He told Celtic TV: "It's a massive step up for me. I know that myself. I'm going to have to be on it to make that step but I'm more than ready.

"I'm really happy to be here and to get the chance to show I can do it at this level.

"It's a massive club with a massive fanbase and it's also got a massive fanbase back in Ireland. I just want to do my family proud and do well."

Scales explained that he can perform a variety of roles within Ange Postecoglou's team.

He said: "Over the years I've played plenty of positions.

"When I was younger I played as a left midfielder, then I dropped back into defence when I was at UCD. I played centre-back in my first season at Shamrock Rovers but we had no players to play wide left this season so I was put out there at left-wing-back and I did alright.

"I'm basically a versatile left-sided defender who can play three positions – left centre-back, left-back or left-wing-back. As long as I'm playing I'm happy."

Scales believes he is well equipped to fit into Postecoglou's system.

He said: "The manager's style of play is high intensity. We have a lot of possession and the full-backs come inside and play as midfielders sometimes.

"It'll take time to get used to the system but I'm already working on it now and I've been watching the games.

"It's similar to Shamrock Rovers in that they're a possession-based team so I know I have the experience to fit right in."