Kilmarnock fans toast victory over Celtic.
Youssouf Mulumbu made his Celtic debut at the weekend against his former club.
It did not end well for him, with Kilmarnock coming from behind to win 2-1.
Mulumbu looked below par compared to his performances for Killie last season and was outshone by former teammate Aaron Tshibola, who is back at the club on loan.
Mulumbu tweeted after the game, expressing his disappointment at the result.
Not the result we wanted but we win together and lose together thank you to the fans especially @CelticFC supporters proud to wear that shirt for the 1st time and we’ll fix what didn’t work today ... pic.twitter.com/NDEHeWQs0g— Youssouf Mulumbu (@mulumbuofficial) September 23, 2018
Kilmarnock wanted to keep Mulumbu in the summer and re-sign him.
He chose to explore his options elsewhere, eventually signing with Celtic as a free agent.
Kilmarnock fans did not approve of this decision, and were glad that it did not pay off early for the midfielder, who tasted defeat on his return to Rugby Park.
Here is a look at how they responded to Mulumbu's message.
Possibly your best ever performance for Killie today— Gary Porter (@dirransathafc) September 23, 2018
how u tweeting u not in tshibolas back pocket?— Jack Havlin (@JackHavlin1869) September 23, 2018
Tweeting live from Tish’s back pocket.— uɐɯuǝd ʎuoʇ (@tonzerp) September 23, 2018
You let yourself down today.
Good luck for the rest of the season (except against the Mighty Killie)
Mulumbu absolutely owned by Tshibola today ⭕⚽️⭕ #WeAreKillie— SC's Juggernaut (@C4mmy31) September 23, 2018
We don't need you— sean ⚽️ (@seankillie) September 23, 2018
Sorry big man but weren’t even fit to lace @AaronTshibola boots today ♂️— MN12 (@MagicalMikael) September 23, 2018