KIERAN Tierney has travelled to Austria with his Celtic teammates as Arsenal prepare a second bid for the left-back.

The English Premier League giants have already had a bid believed to be in the region of £15m rejected by the Scottish champions, but they are set to test Celtic’s resolve by upping their offer, although it is understood their fresh bid will still fall short of the club’s £25m valuation.

It is business as usual for the 22-year-old in the meantime, who flew into Graz yesterday for Celtic’s pre-season tour of Austria and Switzerland as he steps up his recovery from the double hernia operation that saw him miss the conclusion to Celtic’s treble Treble winning campaign.

Not on board the flight though were Tom Rogic, who is facing an injury sweat for the Champions League qualifiers as he nurses a minor niggle, nor David Turnbull, whose protracted transfer from Motherwell ticked on for yet another day.

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Turnbull was expected to be unveiled as a Celtic player on Friday evening after undergoing a medical, but official confirmation of his move to the club has yet to be announced, although that is expected to finally get across the line in the next few days.

Turnbull is yet to join his new teammates at their training base in Austria, where they will kick off a three-match friendly schedule with a game against SC Pinkafeld tomorrow evening.

Neil Lennon’s men then take on Wiener Neustadt in Vienna on Saturday evening, before travelling to Switzerland to face FC St Gallen next Tuesday night.