Sporting Lisbon president Frederico Varandas has confirmed that Viktor Gyokeres will face disciplinary action after going on strike amid strong interest from Arsenal.
Gyokeres, 27, failed to report for the club's pre-season training this week, despite Sporting having granted him an extended summer break until Saturday, July 12.
That patience has now run out, with Varandas vowing to hand the in-demand a 'hefty fine'.
Gyokeres is thought to have agreed pre-contract terms with Arsenal, with the only remaining stumbling block in the way of a move to north London being his transfer fee.
The Gunners are yet to meet Sporting's firm £69m valuation - but Varandas' recent comments show that there are no signs of desperation from the Portuguese club.