Joe Marler will join the Barbarians squad that will face an England XV in the Quilter Cup match on 2 June.
He joins a stellar line-up with those already confirmed including big names from New Zealand, Wales and Argentina like Charles Piutau, John Afoa, Steven Luatua Malakai Fekitoa, Rhys Webb and Facundo Isa.
“Playing for the Barbarians is something I never thought would happen so I’m really excited to be involved — it’s a bit of dream come true,” said Marler.
The 28-year-old quit Test rugby last year, after winning 59 caps for his country since making his debut back in 2012.
Marler added: “I’ve played against them for England, most recently last year, but it didn’t cross my mind that I’d get an invitation so I’m delighted to have been approached.
“I’m really looking forward to running out at Twickenham again but there’s also a bit of trepidation about walking into the Barbarians team room.
“It’ll be like the first day at school when you’re setting out to make a good impression. I know a few people like John Afoa but I’m sure I’ll have to win the others over!”
The double-header also sees the Barbarians women’s side line up against the Red Roses (12:45 BST).
His appearance will come at a time of feverish speculation about whether he might reverse his decision to retire from Tests following Mako Vunipola’s serious hamstring injury.