Celtic have reportedly rejected Arsenal's latest bid for full-back Kieran Tierney.

The Gunners are understood to have already seen a £15m approach rejected for the Scotland international, and reports earlier this week claimed that they had returned with an improved offer of £25m.

However, Sky Sports News reports that Celtic have also now rejected that second bid as they look to hang on to one of their most valuable assets.

The Scottish champions are thought to be unhappy with the way the deal is structured and want more cash upfront rather than included as add-ons.

Arsenal only have a limited transfer budget this summer, but Celtic are refusing to lower their asking price amid interest from both Unai Emery's side and Napoli.

Tierney, who is contracted to the Bhoys until 2023, was limited to just 21 league appearances last season due to a hernia problem.