GERRIT-Jan van Velze will lead Worcester Warriors in their first Aviva Premiership appearance at Twickenham against Saracens in tomorrow’s London double header (3.15pm).

Dean Ryan makes four changes to the side that defeated Newcastle Falcons 28-20 in the league three weeks ago with skipper van Velze and flanker Sam Betty returning to the back row alongside Phil Dowson.

South African international Wynand Olivier also comes back into the side in place of Alex Grove despite the centre’s two-try heroics against Falcons.

Prop Na’ama Leleimalefaga also steps into the front row to partner Niall Annett and Nick Schonert, while Donncha O’Callaghan and Darren Barry keep their starting berths in the second row.

A formidable back three of Chris Pennell, Bryce Heem and Cooper Vuna give Warriors plenty of pace in attack with Ryan Mills in midfield and Tom Heathcote at fly-half.

Scrum-half Jonny Arr will make his 173rd appearance for the club when he steps out on to the hallowed Twickenham turf.

Meanwhile, Saracens legend Ernst Joubert will bring down the curtain on his career with the 35-year old loose forward named at number eight for his final game before hanging up his boots.

Joubert will be joined by Kelly Brown and Will Fraser in the back row.

At lock, Alistair Hargreaves will captain the side and be joined by George Kruis.

Up front, Rhys Gill starts at loosehead prop and will line up alongside Schalk Brits and Juan Figallo.

Ben Spencer comes into the side for Richard Wigglesworth and will partner fly-half Charlie Hodgson.

Brad Barritt continues at centre and will be joined by Argentine Marcelo Bosch in the Sarries midfield.

In the back three, Ben Ransom rotates with Alex Goode and will join Chris Ashton and Chris Wyles.

New signing Samu Vunisa is set to make his Saracens debut from the bench.

Warriors: Pennell; Heem, Olivier, Mills, Vuna; Heathcote, Arr; Leleimalefaga, Annett, Schonert, O’Callaghan, Barry, Dowson, Betty, van Velze. Replacements: Bregvadze, Rapava Ruskin, Rees, Cavubati, Cox, Mulchrone, Lamb, Howard.

Saracens: Ransom; Ashton, Bosch, Barritt, Wyles; Hodgson, Spencer; Gill, Brits, Figallo, Kruis, Hargreaves, Brown, Fraser, Joubert. Replacements: Saunders, Barrington, Lamositele, Itoje, Vunisa, De Kock, Farrell, Tompkins.