Youssouf Mulumbu put in a fantastic performance for Celtic in the Europa League, but dropped down to the bench at the weekend.
Eboue Kouassi has played just one Scottish Premiership game this season with Celtic manager Brendan Rodgers continuing to leave him out.
Jack Hendry has not been in good form for Brendan Rodgers’s Celtic so far this season.
Celtic midfielder Youssouf Mulumbu was at West Bromwich Albion from 2009 until 2015.
Youssouf Mulumbu was in action for Brendan Rodgers’s Celtic against RB Salzburg in the Europa League on Thursday.
Youssouf Mulumbu was a shining light during Celtic's Europa League clash with Red Bull Salzburg in the Europa League.
Aston Villa-owned Aaron Tshibola played with Celtic midfielder Youssouf Mulumbu at Kilmarnock during the second half of last season.
Celtic midfielder is off to a disappointing start.
Kilmarnock fans toast victory over Celtic.
Boyd, a two-time Premiership winner with Rangers, saw his current employers overcome Celtic 2-1 on Sunday.