Released at U15, now worth £60m: Celtic suffered their biggest howler of the century - opinion

If Celtic fans have got one eye on Liverpool’s Premier League clash against Manchester United, then they might feel a tinge of regret at seeing Andy Robertson doing so well for the Reds.

The left-back initially joined the Hoops’ academy all the way back in 2003, before the Hoops decided against offering him terms to stay at Parkhead.

Indeed, speaking in 2013, the defender himself said: “I was let go by Celtic at U15 level for being too small. That was the reason they gave me anyway. Being told that by Celtic made me determined to succeed. It was hard to take, nobody wants to get told they are not at that club any more, and my confidence took a hit.”

Following his move to Dundee United, Robertson admitted that his Parkhead exit shaped him into the player he is now, saying: “If Celtic hadn’t let me go, would I be where I am now I’m grateful because I’m at United but I didn’t plan on leaving Celtic. The way it has gone, though, I’m glad things turned out this way.”

After his stint there, the full-back made the move down south, where he linked up with Steve Bruce at Hull City, helping the Tigers earn promotion to the Premier League and enjoying one season in the top-flight.

Those performances were enough to him a high-profile move to Liverpool, where he has been nothing short of a revelation for Jurgen Klopp’s side.

Speaking after his arrival back in 2017, Klopp himself raved: “For Andrew this is another big step on what has been a quite incredible personal journey in a very short space of time.

“I love his story; where he has come from professionally to reach this point. When you speak to him it is clear why he makes his progress. He has a burning love for playing football – he really loves the game. His attitude is