At the start of the 2018–19 season, Boëtius received a disciplinary suspension for refusing a training mandatory for players who did not start the match against Fenerbahce. During the first league match of the season, the attacker was sent off after receiving his second yellow card, for a sarcastic applause towards the referee after receiving his first yellow card. After that, Feyenoord manager Giovanni van Bronckhorst told him it was going to be a difficult situation for him, and he was allowed to leave the club.
