The Ibrox outfit were just one club of many in attendance.
As we rapidly approach the January transfer window, clubs around the continent are frantically searching for in form talent and potential stars of the future.
The Belgians struggled at the start of the 2019/20 season but are undefeated in their last eight competitive matches, five of which have been victories.
A total of 12 clubs are named in the report, with the list also including Manchester United and Ajax.
Who could they be watching?
The Belgian outlet suggests that two prospects, in particular, could have been on the radar of the visiting club representatives.
One of those is 18-year-old attacking midfielder Yari Verschaeren, who has made a real breakthrough into the Anderlecht first-team over the last two seasons. He's made 37 appearances in that time, scoring four goals and assisting five more. He started Friday's 2-1 win.
Another who started that match, also named in the report, is the more defensively minded central midfielder Albert Sambi Lokonga. A bit older at 20-years-old, he's also been a regular for the club this season and has made 25 senior appearances in total since 2017.
HLN, however, reckon that the Belgian club are not keen on selling either right now, even in the face of monster bids.
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