In the competition’s expanded format of 40 teams playing in 10 groups, with the group winners in addition to the best six runners-up advancing to the Round of 16, competition will be more intense than ever to book a place in the knock-out stages.

With only the group winners guaranteed to advance to the Round of 16, where they will be joined by the six best runners-up across the 10 groups in the expanded competition, the battle for points will be intense.

An intriguing Group D in Riyadh will see Al Wehdat become the first side from Jordan to ever appear in the competition as the Amman club will go up against Qatar's Al Sadd SC, Iranian team Foolad Khouzestan and hosts Al Nassr.

With the opening round of fixtures taking place on Wednesday, the-AFC.com looks at the stadiums, key players and games to keep an eye out for.

In the competition’s expanded format of 40 teams playing in 10 groups, with the group leaders in addition to the top six runners-up qualifying to the Round of 16, competition will be more intense than ever to book a place in the knock-out stage.

One of the West Zone’s most interesting groups will be found in the United Arab Emirates, where Sharjah will welcome Uzbekistan Super League holders FC Pakhtakor, Iranian Cup winners FC Tractor and Air Force Club of Iraq, who sealed their place with a thrilling play-off win earlier this week.

Ahead of Wednesday’s kick-off, allow the-AFC.com to bring you up to speed with the venue, star players and the group’s context.

A record 40 teams split into 10 groups will take part in the 2021 AFC Champions League as the competition continues to go from strength to strength, showcasing Asia's finest teams and numerous world-renowned players.

Having so far looked at the tournament over its first 15 years, we shift the focus to the more recent editions, when there was glory for a trio of powerhouses from Japan, Saudi Arabia and Korea Republic.

Persepolis are making their 11th appearance in the Continental showpiece and have India’s FC Goa, Al Rayyan of Qatar and UAE’s Al Wahda FSCC for company in Group E.