Stiliyan Petrov has warned Celtic that a team like Manchester United would have “no problem” in trying to sign Kieran Tierney this summer.

The Scottish Sun reported in March that Manchester City, Leicester and Borussia Dortmund are eyeing up the £25million-rated left-back ahead of the summer transfer window, which is something Hoops legend Petrov is not surprised to see.

“I don’t know if it will be this summer or next but I do think that at some point Celtic’s resolve will be tested,” Petrov said, as quoted by the Glasgow Evening Times.

“And if a huge offer comes in then the reality is that you have to take it. It will take big money to get him. I don’t know how much that will be but it will be no problem for a Manchester United or whatever.

“Right now the boy just has to keep doing what he is doing. Getting into the Champions League can be so important for his development because you learn so much when you are in that environment and playing against the best.”

IS HE SPECIAL?

Tierney is one of the best players plying his trade at Celtic Park right now and has been the Bhoys’ best left-back in a very long time. The Scotland international is only 21-years-old, but he has already made 168 appearances in all competitions for the Hoops and earned 12 caps for his nation. Tierney has also lifted seven trophies with Celtic, and that number is more than likely going to reach nine before the summer starts. Tierney is defensively sound but also a major threat in attack. His marauding runs down the left-flank have caused all sorts of problems for teams in Scotland, and he is bound to be a success south of the border, or in Germany, if an interested party manages to sign him in the summer. Tierney is one of the best left-backs in European football and Celtic fans should be fearful about losing him in the summer, especially as a legend like Petrov reckons that the Hoops should be bracing themselves for offers.

WILL HE LEAVE?

Tierney has already won everything there is to win in Scotland on multiple occasions and is on the verge of winning a third domestic treble in a row. He was also a key player in the invincible season during Brendan Rodgers’ first campaign at Parkhead, so the left-back could have it in his head that he needs a new challenge. Clubs will definitely bid for him in the summer and playing in the Premier League for one of the Manchester clubs or German giants Borussia Dortmund would offer him the chance to get a lot further in Europe than he has done at Parkhead. They would also be able to offer him a lot more money – we can’t pretend that money doesn’t matter in these situations. If a top-six Premier League side comes in for Tierney then Celtic fans should except him to leave. Petrov’s warning is more than likely going to be bang on the money.

INTERESTING FACT

Tierney was born on the Isle of Man and has previously expressed his desire to play for Ellan Vannin, the island’s national team.