Kieran Tierney: Arsenal 'optimistic' over Celtic defender deal

Arsenal are in talks with Celtic to sign Scotland defender Kieran Tierney.

The Premier League club had a £15m bid rejected by the Scottish champions but are expected to return with an improved offer for the 22-year-old.

There is optimism that an agreement will be reached between the two clubs, and personal terms are not expected to be a stumbling block.

Tierney has only played sporadically this year because of a hernia problem and is recuperating from surgery.