Wasps boss David Young believes his team will need to take a considerable step up when they tackle Aviva Premiership rivals Saracens at Vicarage Road on Sunday.
Wasps have won four successive games in all competitions - their best sequence of results since December 2010 - but they last recorded a Premiership away win 12 months ago. But Young, for one, is not getting carried away.
"While it is good to be heading to play Saracens with some momentum behind us, we are under no illusions as to how much improvement we will have to make this weekend," Young said. "They are a side who know how to win, and we need to step up massively to take anything out of the game."
He added: "They (Saracens) will be missing a few players, but to be honest, they have such a good squad that we know the guys coming in will be doing everything they can to stake a claim to the shirt."
Wasps' England flanker James Haskell returns after missing the bonus-point victory over London Welsh last weekend due to illness, but injuries sideline centre Lee Thomas and scrum-half Joe Simpson. Chris Bell and Eliot Daly team up together in midfield, with Charlie Davies wearing the number nine shirt.
Saracens, meanwhile, are without their sizeable England contingent, while Wales prop Rhys Gill is absent injured as they play their first fixture at Vicarage Road since May.
Charlie Hodgson returns at fly-half, with Chris Wyles and Kameli Ratavou also starting behind the scrum. Prop Matt Stevens, meanwhile, switches from tighthead to loosehead in a team that also inclues new Scotland skipper Kelly Brown.
Wales international Gavin Henson moves from fly-half to centre for London Welsh against Kassam Stadium visitors Bath on Sunday, with Gordon Ross taking the number 10 shirt.
Elsewhere, full-back Tom Arscott starts after injury, with Tom Voyce switching to the wing, while scrum-half Nick Runciman, prop Tom Bristow and number eight Lee Beach all feature.
Bath welcome back Matt Banahan to their midfield following an eight-week injury absence, with prop Anthony Perenise replacing England squad member David Wilson. Injuries though, sideline flankers Carl Fearns and Francois Louw, meaning call-ups for Stuart Hooper and Will Skuse.