The 24-year-old's move to the Riyadh-based club is expected to go through after West Ham accepted an offer worth an initial £55million plus a further £5million in add-ons on Tuesday afternoon. The Hammers had previously turned down a bid in the region of £40million for the winger, who had also been linked with a move to Aston Villa.
Summerville's departure represents a substantial windfall for West Ham, who were relegated from the Premier League in May and have been working to cut their wage bill and raise funds. The club have also sold midfielder Mateus Fernandes to Tottenham for £85million this summer, though they have moved to keep hold of another key attacker, Jarrod Bowen, who is staying on adjusted contract terms as the club prepares for life in the Championship.
Manager Nuno Espirito Santo has been retained by the Hammers as they look to secure an immediate return to the top flight during the 2026-27 campaign, with the funds generated by Summerville's sale expected to support further squad rebuilding as the club adjusts to its new financial reality outside the Premier League.
Summerville joined West Ham United from Leeds and quickly established himself as one of the club's most dangerous attacking threats, his pace and directness making him a persistent target for interest from elsewhere even before relegation made a sale all but inevitable.
AS Roma had also been credited with an interest in the winger before Al-Hilal's late intervention comfortably outbid their rivals, a pattern that has become increasingly familiar for Premier League and Championship clubs facing offers from Saudi Pro League sides this summer.
For West Ham, banking close to £60million on a player valued considerably lower only a matter of weeks ago represents a significant boost to their rebuilding efforts under Espirito Santo, giving the club further financial firepower to strengthen the squad before the Championship season gets under way.