ARSENAL have made a record-breaking £25 MILLION bid for Kieran Tierney.

Unai Emery has increased his offer for the Celtic left-back and is confident of finalising the BIGGEST transfer in Scottish football history.

3 Arsenal have upped their offer for KT Credit: Kenny Ramsay - The Sun Glasgow

The Gunners had a £15m offer rejected by the Scottish Premiership champions three weeks ago but they have returned with a bigger bid.

And sources at Parkhead say it is “inevitable” that Tierney, 22, will make the move to the Premier League after four stunning seasons since his senior breakthrough.

Celtic will weigh up whether to accept the offer and break the Scottish record of £19.7m Lyon paid Celtic for Moussa Dembele last summer.

Arsenal have been tracking Tierney since his debut in 2015.

3 Big thumbs up from Emery as he makes record-breaking bid for KT Credit: Reuters

They have now moved this window to make him Nacho Monreal’s long-term successor at the Emirates, regardless of whether the 33-year-old stays at the club next season.

At £25m Tierney comfortably fits into the £40m budget Emery has after failing to get into the Champions League this season.

The Scotland international is recovering from a pelvis injury at the moment and is facing a race to be fit for the start of the domestic season in three weeks’ time.

3 Tierney is on way back as he continues recovery Credit: Kenny Ramsay - The Sun Glasgow

Landing Tierney would be a coup for Emery as big clubs have chased the full-back since he emerged at Celtic.

Manchester United were long-term admirers and recently Leicester have tracked him.

But he looks set to start his career in England at Arsenal as Emery looks to mastermind a return to the top four next season.

SunSport revealed on Saturday that Tierney was still suffering pain in his pelvis despite a double hernia operation in May.

The star is too sore to start running.

Celtic manager Neil Lennon said: “KT still has the osteitis pubis problem so it’s a slow burner that one.

“We will need to get to the bottom of that.”