Comedian Tracy Morgan has spoken out for the first time after he was seriously injured in a multi-car pile up in New Jersey to assure fans he is feeling "strong".

The 30 Rock star was hospitalised in a critical condition on 7 June (14) when a Wal-Mart truck slammed into the back of a limousine he was travelling in, killing his mentor and colleague James 'Jimmy MACk' MCNair.

Morgan, 45, was released from a rehabilitation centre last week (ends11Jul14) and has since returned to his New Jersey home, where he will continue his recovery for injuries including a broken leg, a broken nose and several broken ribs.

On Monday (14Jul14), he was pictured back on his feet with the help of a walker as he was helped into a waiting car outside his house.

Asked how he was feeling, he told photographers, "I'm Ok. I feel strong. Love you. Thank you very much. I appreciate it."

Wal-Mart driver Kevin Roper stands accused causing the multi-vehicle accident after allegedly falling asleep at the wheel of his truck.

Morgan, his assistant Jeffrey Millea and comedian Ardie Fuqua, who were also injured in the crash, filed suit against bosses at the U.S. superstore on Thursday (10Jul14), accusing them of negligence, alleging company executives should have known Roper had been awake for more than 24 hours and that his drive from his home in Georgia to work in Delaware was "unreasonable".

Roper denies charges of vehicular homicide and assault by auto.