Former Arsenal and Celtic striker John Hartson believes the former got Kieran Tierney on the cheap.

The Gunners paid £25m for the Scotland international this past summer.

"Arsenal probably got him on the cheap if you look at the fact Manchester United paid £50m for Aaron Wan-Bissaka," he told the Daily Record.

"Also, average players are going for £30m or £40m and Kieran is certainly not average.

"Celtic could have held out for another £5m or so but it is still good money they have banked, especially due to the fact he has come through the ranks and hasn't cost the club a penny.

"He is worth £25m and he can excel in a different league because there's a perception the Scottish league is just not as good."