The 31-year-old, who last month joined the former Asian champions for 90 million euros ($95.9 million) from Paris Saint-Germain, was introduced in the 64th minute for fellow Brazilian Michael and set up Malcom to score Al-Hilal's fourth in the 83rd minute.
"The Atlantic lion is our goalie," Al-Hilal posted on messaging platform X, formerly known as Twitter.
Saudi Professional League (SPL) club Al-Hilal announced that Neymar had signed a contract until 2025, with the Brazilian saying, "I am here in Saudi Arabia, I am Hilali" in a video on the team's social media accounts.
The 26-year-old is the Al-Hilal's fourth signing this summer after Senegal defender Kalidou Koulibaly, Serbia midfielder Sergej Milinkovic-Savic and Portuguese midfielder Ruben Neves.
"What an unbelievable journey. A big thank you to every single person I had the chance to work with, every single moment was unforgettable," a tearful Neves said in an emotional farewell video.
Diaz, however, stressed his sights are fixed on the meeting with Urawa at Saitama Stadium in the continental club final rather than the future of Argentina's World Cup-winning captain.
Al Hilal, who won their fourth Asian crown in 2021, go into the game at Riyadh's King Fahd International Stadium showing signs that a packed season is taking its toll.
Al Ahly, the 10-time record champions of Africa, know that nothing but victory could send them to the quarter-finals.
The defending champions squeezed past Iran's Foolad on Thursday to set up the meeting with the Qatari club in Doha, with the winners due to take on Japan's Urawa Red Diamonds over two legs in the final on April 29 and May 6.
Matches are scheduled to begin on April 7 with the winners of each group advancing to the last 16 alongside the three clubs with the best runners-up records.
The game was played under tough weather conditions as the temperature hit 34C, which affected the performance of the players.
The Sudanese giants did not accept CAF's decision and requested a meeting with CAF to know the reasons behind the decision.
The 32-year-old is currently the Saudi Professional League's joint top scorer, with 12 goals alongside Al Nassr's Anderson Talisca.
Qatar's hosting of the World Cup finals in November and December means the Asia Champions League's usual slot in the schedule is unavailable.
Gomis has scored six times in this year’s competition, still some way short of his tournament-leading 10 goals in the 2019 edition.
Familiar foes face off in the battle for berths in next month's Asian Champions League final as Saudi Arabian duo Al Hilal and Al Nassr.
Saudi Arabia will host the final of this year's Asian Champions League on Nov. 23, the Asian Football Confederation (AFC) confirmed on Friday.
Asia's football body is "confident" of completing its coronavirus-hit Champions League this year.
The Saudi Al-Riyadh newspaper said that Zamalek would move officially within days to negotiate with the Saudi club Al-Hilal to sign the Syrian player Omar Khirbin.
Maaloul, 30, established himself as one of the key players in the Red Devils' squad since he joined Al Ahly from his childhood club, Club Sportif Sfaxien.