The Nobok Challenge, which will take place at Twickenham on Saturday, June 4 (kick-off 7.30pm) in the midst of the IRB London Sevens tournament, will see the 2003 World Cup-winning captain field a team against a Jonah Lomu XV.
Along with Celtic Cup winner Henderson, Wasps and England duo Joe Worsley and Simon Shaw, Leicester winger Leon Lloyd, Tom Smith of Scotland and Northampton and Sale's French back row Sebastien Chabal were added to Johnson's panel today.
They join Mark Cueto, Jamie Noon, Tony Marsh, Raphael Ibanez, Kyran Bracken, Austin Healey, Andy Goode and Olivier Magne who have already been confirmed to play for Johnson.
* Tickets (Stg15-Stg45) for the Nobok Challenge match, which is being staged as part of the Emirates Airline IRB London Sevens, are available now from Ticketmaster UK (tel: 0044 (0)870 902 0000)
** All spectators attending the game will be given a free match programme and a complimentary DVD featuring the careers of Martin Johnson and Jonah Lomu as part of their ticket price