The Harlequins lock makes the final appearance of his professional career at Twickenham leading a cosmopolitan side from nine different countries.

He starts alongside his Quins teammate Joe Marler, who lined up for England last year when they suffered a record 63-45 defeat against the famous invitation side.

Head Coach Pat Lam’s side also includes World Cup winners in New Zealand’s John Afoa, Colin Slade, Malakai Fekitoa and Liam Messam. Lam has four representatives from his Bristol Bears side in Afoa, Charles Piutau, Steven Luatua and Chris Vui.

“I probably didn’t expect it to happen, I know I’m lucky to be here, but I’ve wanted to play for the Barbarians since I became a professional rugby player and to lead them is very special,” said Horwill.

"We’re a very good team, a group of guys who have come together well in the last few days and we have a lot of exciting players I’m looking forward to playing alongside.

"I’ve enjoyed being with people like Charles Piutau, who I’ve played against in Super Rugby and over here,  and then big John Afoa is the elder statement leading the charge. 

"If we can get the ball to Charles Piutau and big Taqele Naiyaravoro, we won’t be too bad."

1 Joe Marler (Harlequins & England)

5 Chris Vui (Bristol Bears & Samoa)

6 Steven Luatua (Bristol Bears & New Zealand)

8 Viliame Mata (Edinburgh & Fiji)

17 Pierre Schoeman (Edinburgh)

18 Finlay Bealham (Connacht & Ireland)

19 Facundo Isa (Toulon & Argentina)

20 Liam Messam (Toulon & New Zealand)

21 Rhodri Williams (Dragons & Wales)