Celtic booked their ticket to the Europa League knockout stages, but still suffered a defeat.
Brendan Rodgers' men booked their place in the Europa League knockout stages but rounded off their Champions League campaign with a 1-0 defeat to the Belgian outfit who they thrashed 3-0 in the reverse fixture earlier in the season.
It was a poor performance from the Scottish Premiership side, leaving many of their supporters extremely frustrated on social media despite the fact that they ensured that they would be playing European football after Christmas.
The player who seemed to come in for the most criticism on Twitter after the defeat was Stuart Armstrong who played the first-half at Celtic Park before being replaced by Olivier Ntcham at the break.
Despite Armstrong looking inspired during Rodgers' first season at the club, his form this season has been considerably more underwhelming - for example, he has scored just once in the top flight this term.
And many of the supporters not only want the midfielder to be dropped by Rodgers after his performance against Anderlecht, but some have even suggested that the club should look to sell him in January if they get any offers for him.
Here is the best of the reaction...
Stuart Armstrong want to find an agent that can advise him on how to retain possession.— Korean Whippet (@JonBoy__9) December 6, 2017
Ntcham should have started Armstrong does my nut in giving the ball away. Frustrating Celtic can play alot better. Does you're nut in watching that game. Anyway European football in February— MaxiBhoy1⃣0️⃣3️⃣6️⃣7️⃣ (@BrianMa45170220) December 6, 2017
Hope I never have to watch Stuart Armstrong struggle passing a ball in the champions league again #ronniemince— David Neil (@Davieneil) December 6, 2017
Stuart Armstrong is absolutely not good enough for Europe, been proven time and time again, would be very surprised if Southampton are actually interested in him— Mark (@3Mark1888) December 6, 2017
#CelticFC We need to invest on some European quality football players!, Sinclair and Armstrong can’t cut it the last few weeks they’ve been missing in the spl never mind the champions league!— Dec Larkin (@DecLarkin) December 6, 2017
Brendan needs to drop a few golden boys ntcham ajer and edouard should be straight in I'd be happy to never see Armstrong in a Celtic top again— ☘jai☘ (@_jaicoybig) December 5, 2017
Armstrong and Sinclair were awful. Did Armstrong complete a pass?— Gary Prince (@Garysinnocent) December 5, 2017
Armstrong has been awful all season yet Rodgers continues to pick him— Kev (@KevinMcG01) December 5, 2017
We should be looking to move Stuart Armstrong on in January. The one year contract extension in the summer was a cop out and his heart's not in it. Ntcham should now be given a decent run in the side to establish himself.— St.Anthony (@Stephen4_2) December 5, 2017
Get rid of sinclair, Armstrong. Don’t look interested. We can play with 2 proper strikers then. Also we need cb and rb!— Football Transfers (@newtransfers17) December 5, 2017