Slavia Prague's player opted against taking the knee before kick-off of their Europa League clash with Arsenal on Thursday.
The Czech side are at the centre of an ongoing investigation into centre-back Ondrej Kudela, who is alleged to have racially abused Rangers' Glen Kamara in their last-16 clash.
Arsenal's players continued to take the knee, as the sides were split on the gesture.
Slavia Prague and Arsenal were split on taking the knee on Thursday in the Europa League