ARSENAL are preparing a third offer for Celtic's £25million-rated Kieran Tierney, according to reports.

The Scottish left-back is known to be happy at Parkhead — but Unai Emery is keen to tie up reinforcements in a troublesome defensive area for the Gunners.

4 Tierney could be on his bike before the Premier League transfer deadline on August 8 Credit: Kenny Ramsay - The Sun Glasgow

4 Tierney has missed most of Celtic's pre-season games due to injury Credit: Getty Images - Getty

According to the Express, Arsenal are set to go in with a third bid for the 22-year-old, despite the fact that he has missed most of Celtic's pre-season games due to injury.

Napoli were also interested in signing Tierney but Carlo Ancelotti ruled out a move, claiming he is happy with Faouzi Ghoulam and Mario Rui.

Arsenal were understood to be tantalisingly close to agreeing a fee for Tierney last week.

And they have landed the £72million capture of Nicolas Pepe, with the Ivorian set to complete his move to the North London club in the next 48 hours.

SunSport has revealed exclusive pictures of suited-and-booted Pepe arriving at the club's training ground for his club-record move.

Elsewhere there is more positive news for Arsenal.

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4 Arsenal could line up with a new look squad if Unai Emery secures his transfer targets

Matteo Guendouzi is set to be offered a new contract with improved terms on his £40,000-a-week salary, according to reports.

The Gunners face Angers in a pre-season friendly on Wednesday before heading to Barcelona to face the La Liga winners at the Nou Camp on Sunday.

And Emery's side face Newcastle in the Premier League opener at St James' Park on the first Sunday of the Premier League season.