Arsenal are set to test Celtic 's resolve over Kieran Tierney with a second bid for the full back, according to reports.
The Premier League giants have made the Hoops star a top summer target as they look to fill a problem area in Unai Emery's squad.
It's claimed the Gunners made an opening move of £15million for the Scotland international but fell well short of the Premiership champions' valuation.
That, it is understood, stands closer to the £25m bracket with Tierney still having four years left on his deal.
But Arsenal are expected to return with a new bid and, according to the BBC, are in talks with Celtic over the left back. Personal terms would not be a problem for the Londoners.
The Scotland star, set to return for the new season after undergoing double hernia surgery, has also attracted interest from Leicester City, Lyon and Napoli.
But former Hoops star John Hartson slaughtered the reported opening bid from Arsenal this morning - dubbing it an "embarrassment".
And Hartson , who played for both the Hoops and Arsenal, reckons the Premier League club should be left red-faced by what's been put on the table.
Taking to Twitter, Hartson said: "My old club Arsenal testing the waters with reported 15m bid for Kt.
"Celtic don’t want to sell besides that in this current market 15m is an embarrassment to the player and his ability."
Celtic boss Neil Lennon is expecting interest in his top players including Tierney this summer but has vowed to fight tooth and nail to hold onto the left back, a Celtic diehard.
He said: "I would expect bids. We’re realistic and I’d be surprised if there weren’t any offers for them, put it that way because they’re both extremely talented players.
“So I may have a decision to make but there’s been nothing for us to think about yet.
"For someone so young, Kieran already has vast experience – he’s played Champions League, Europa League, internationals and he’s won trophies.
“I don’t think he would fear going anywhere but, personally, it would be a wrench for him because the club means so much to him.
“However, we’ll cross that bridge if and when we come to it but we don’t want to lose him.”
