Celtic hero John Hartson believes Manchester United are determined to sign Kieran Tierney.

However, the former Wales international has urged the sought-after defender to stay put for another season.

Speaking on BBC's Scottish Football Podcast, Hartson said:"I'm hearing he's Manchester United's number one target.

“But why on earth would Brendan Rodgers sell Tierney right now?

“If I'm Brendan Rodgers, Im saying to [Jose] Mourinho, 'Let him have another season here, keep your £25-30m for now, he's got Champions League football, he loves playing for Celtic.

“If Kieran Tierney has another season, if he's outstanding in the Champions League, playing really well against the top teams, in the spotlight, all over the world being looked at by the top clubs.

"All of a sudden, next year or the year after, you're getting £45-50m for him.

“That's how inflated these prices are now in terms of everybody paying absolutely massive odds, because the transfer have gone absolutely ridiculous. It's absurd.

“I have every confidence in Kieran Tierney to become a top, top player. He is a great player now, but he can only get better."