Their 21-22 defeat at Newcastle last weekend brought a storm of criticism for their 'cynical' play.
"The key against Bath will be to recognise that in our situation a team can become too desperate for a win and don't go away from our strengths," said Greenwood. "We cannot afford to go into our shells."
Warren Gatland, the London Wasps director of rugby, has added captain Lawrence Dallaglio to a list of wounded internationals that includes Craig Dowd, Simon Shaw, Stuart Abbott, Fraser Waters and Rob Howley.
Dallaglio could be on the bench despite his rib injury as Wasps take on Irish at the Causeway Stadium on Sunday.
Gatland said: "We do have an injury problem, but it is nothing to panic about. Last season we had the World Cup to cope with, so this shouldn't be a problem."
Irish have made three changes from the team outmuscled by Leicester with Scott Staniforth moving from wing to full-back, Justin Bishop returning from injury to the wing and Paul Hodgson starting at scrum-half.
Saracens are home to Leeds on Sunday with wing Paul Bailey fit along with former captain Simon Raiwalui, who is on the bench. The second row pairing is a new combination of captain Hugh Vyvyan and Kris Chesney.
