Washington DC, March 19 -- Actor-comedian Tracy Morgan had to leave Madison Square Garden in a wheelchair on Monday night after falling sick during a New York Knicks game against the Miami Heat.

Fans were worried after videos of the incident went viral, but Morgan has now assured everyone that he is doing "okay."

Taking to Instagram on Tuesday morning, the '30 Rock' star dropped a smiling picture from his hospital bed and updated fans on his health, stating that "food poisoning" was the reason behind his sudden illness and thanked everyone for their concern.

"Thank you for all your concern! I'm doing ok now, and doctors say it was food poisoning. Appreciate my MSG family for taking such good care of me and I need to shout out the crew ...