Al-Ahli are a long-established Saudi club, founded in 1937, and operate with a squad valued at around £148m by Transfermarkt. Their group is sizeable rather than bloated on paper: 32 players, with an average age of 26.
Their recent league form was strong. A 2-0 defeat to Al-Nassr was followed by five straight wins, including a 4-0 home win over Al-Okhdood, a 3-0 against Al-Kholood, and a 4-1 away win at Al-Khaleej. That is the sort of sequence that points to a side with attacking weight and a decent rhythm.
For Celtic supporters, Al-Ahli sit as a credible neutral opponent rather than a familiar European reference point: financially substantial, experienced, and coming off a convincing run of results.