The Reds were drawn in Group E alongside LASK, Toulouse and Union SG having missed out on Champions League qualification for the first time since 2016.
The final away trip of the group stage will see Jurgen Klopp take his side to Belgium to face Union SG on December 14, but the clash will not take place in the hosts usual home stadium
The Belgian side, who finished third in the Belgian Pro League last season, typically play all of their home fixtures at Stade Joseph Marien, which holds around 9,000 supporters.
Instead, Liverpool will visit Lotto Park home of Anderlecht which has a capacity of 21,000 and is situated less than three miles from Stade Joseph Marien.
Union SG have used Lotto Park for their home fixtures in recent European campaigns having formed agreements with Anderlecht in the past.
The club have confirmed on their official website that they will also welcome LASK and Toulouse to the stadium in the 2023/24 group stage.
Liverpools last visit to Lotto Park came in October 2005 as they looked to defend the Champions League trophy they lifted in Istanbul five months earlier.
The match will be a family affair for Alexis Mac Allister, who is set to come up against his brother Kevin in the two fixtures between the sides.
Kevin Mac Allister joined the club last summer from Argentinos Juniors, where both his brother Alexis and his father Carlos have played in the past.
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Royale Union Saint-Gilloise (@UnionStGilloise) September 1, 2023
