AFC Champions League Elite
While Qatar's Al Rayyan had to work hard to seal qualification, Al Ahli cruised through the League Stage and only finished second to fellow Saudi Pro League side Al Hilal SFC on goal difference.
Al Rayyan will dare to dream after advancing to the Round of 16 of the continental tournament for only the second time.
Their record against Saudi teams, however, is pretty grim reading with Al Rayyan having lost all three League Stage encounters, including a 2-1 defeat to Al Ahli.
Preview: Round of 16 (1st Leg) | AFC Champions League Elite™
While Al Ahli only have an outside chance in the race for the Saudi Pro League title, they will head into the tie against Al Rayyan having stunned Al Hilal 3-2 on Friday with Ivan Toney netting a hat-trick.
They were also unstoppable in the League Stage - winning seven and drawing one with Riyad Mahrez being their key man.
The Algerian netted five goals and provided seven assists and Al Rayyan will have to keep Al Ahli's star player quiet if they are to take something from the game.
Al Rayyan SC (QAT) v Al Ahli Saudi FC (KSA)
Venue: Ahmad Bin Ali Stadium (Al Rayyan)
Kick-off: Tuesday, 21:00 (UTC+3)