Tracy Morgan Transferred to a Rehab Center

Comedian is expected to remain at the facility "for the next few weeks"

The next phase of Tracy Morgan's recovery has begun.

"Tracy has been transferred to an undisclosed rehab center, where he is expected to remain for the next few weeks," his rep told E! News Friday. "While he is continuing to show signs of improvement, he still has a long way to go. He and Megan wanted to publicly express their deepest gratitude to everyone at Robert Wood Johnson University Hospital for the unbelievable care and attention they provided him."

Morgan, 45, suffered broken ribs and a broken leg following a June 7 car crash on the New Jersey Turnpike. The collision killed fellow comedian James McNair and seriously injured two other people.

The former 30 Rock and Saturday Night Live star's assistant, Jeffrey Millea, was recently upgraded to fair condition. Meanwhile, hospital officials said Monday that comic Ardie Fuqua remains in critical condition.

Walmart driver Kevin Roper was going 65 mph in a 45-mph zone just before the crash, according to the National Transportation Safety Board's report released Thursday.

Roper, 35, has pleaded not guilty to death by auto and assault by auto charges. A criminal complaint accuses him of not sleeping for more than 24 hours before the crash, a violation of New Jersey law.