Celtic’s 20-year-old left-back has made a big name for himself already.
Tierney has earned successive PFA Scotland Young Player of the Year awards, and English clubs are watching.
Manchester United and Arsenal have been credited with interest in the Celtic star.
And with Chelsea pursuing support for Marcos Alonso, Adam has highlighted the quality Tierney possesses.
Stoke’s midfielder got the Potters to target a move of their own, only to be put off by his price-tag.
“He could play for a Liverpool, Chelsea, Arsenal or Manchester United without a doubt”
However, any of England’s big dogs – including United, Arsenal, Chelsea and Adam’s former club Liverpool – could move for Tierney, Adam believes.
“Tierney is Scotland’s best player now – he is different to anything else we have got,” Adam told the Daily Record.
“After I’d watched Tierney a couple of times I spoke to the people at Stoke about going for him. But unfortunately the figures being mentioned are too big – even for a club like us.
“If you’re talking between £20-25million for a left-back, that’s a lot of money. But I hear people from English clubs talking about him.
“He is the next one who could go to a Premier League club and play regularly.
“He could play for a Liverpool, Chelsea, Arsenal or Manchester United without a doubt.
“His hunger, desire and quality make him the best we have produced for years.
“Brendan Rodgers has done a great job with him at Celtic and the fact he loves the club is a bonus.
“But there will be a time when he takes a chance and wants to go and try the Premier League.
“He could be playing in the Champions League for one of the top clubs and he’s good enough to do it.
“He’s a top player and it won’t be long before he’s down here.”