Gelson Martins has been left furious after Sporting Lisbon rejected an offer from Arsenal, according to a report.
The 23-year-old recently emerged as a top attacking target for the Gunners, potentially on a free transfer due to uncertainty regarding his contract.
Arsenal would more likely have to pay close to £40m to sign the Portugal international, though, and A Bola suggests that their opening offer has fallen some way short of that asking price.
A bid of £26m has been knocked back by Sporting, who believe that interest from Manchester United and Liverpool may drive up his valuation.
Martins scored 13 goals and provided the same number of assists during the 2017-18 season, and he is said to be keen on a move away from Lisbon.
