The latest witness at the Charbonneau Commission won't be able to testify for a week after falling and injuring himself at his home.

Ken Pereira was walking down the front steps of his residence early Tuesday morning when he slipped and hit his head.

Pereira wanted to shake off the injury and make his way to the public inquiry into corruption, but he started vomiting, which can be a sign of a concussion.

The police officer who is guarding Pereira decided to bring him to hospital to get treatment.

That same officer notified the commission about what had happened, and the inquiry began with a request for adjournment.

"Given the circumstances I am requesting that [Pereira's] testimony be cancelled for today and resume tomorrow," said prosecutor Simon Tremblay.

Later in the day the commission announced that Pereira needed a week of rest, and so it would adjourn until Oct. 15.

Pereira has spent several days testifying about union actions that occurred while he was an executive with the FTQ-construction, and he's accused several people of making fraudulent expense claims, of being offered bribes, and of letting criminal gangs decide which union members were able to work.

Several groups wish to cross-examine Pereira, a process which began on Monday afternoon and is scheduled to resume Wednesday, with Andre Dumais, lawyer for one of Pereira's former employers being the next to ask questions.