Ivan Toney passed a medical on Friday ahead of a proposed £40million move from Brentford to Al Ahli.
The Saudi Arabian club, who have until Monday to close their business, sparked life into transfer deadline day by making offers for both Toney and Chelsea target Victor Osimhen of Napoli - but can only sign one.
The question mark for Toney remained whether to take the lucrative three-year deal now to suit Brentford or wait until January when he could have greater options.
Arsenal were previously tempted by Toney's availability but later decided against pursuing a transfer as Brentford held out for a huge fee for the England international.