Fans condemned for Kalulu banana throw
Kalulu, a Frenchman of Rwandan descent, was also pelted with various airborne missiles when the 22-year-old went to take the corner in the ninth minute of Basel's 2-0 win against FC Zurich.
One of these objects was a banana, which FC Zurich have confirmed came from the home end where their supporters were sat.
Zurich issued a statement that said: "In the early stages of (the match) against Basel, a banana was thrown out of FCZ's fan zone towards FCB player Aldo Kalulu when he went to take a corner.
December 10, 2018
"The club strongly condemns this racist behaviour and does not tolerate it in any way. There is no room for xenophobia and discrimination in football.
"FCZ has always been committed to diversity and welcomes all people, regardless of their background or religion."
The Swiss Football League has yet to comment on the incident.