The Daily Star says the Gunners legend was put through a double training session to prepare him for a sensational return to action at Fulham on Monday. Henry, 34, also took part in a team meeting yesterday as he embarks on his second spell with the north Londoners.
Club record scorer Henry - who will wear the No.12 shirt - is expected to stay six weeks before returning to New York Red Bulls for the start of their season on March 11.
The Premier League confirmed last night Arsenal could register a player before the transfer window opens on Sunday. That means Henry could make his second debut for the club at Craven Cottage.