Dan was in poor form with the boot last week but Sean thinks the stand-off will come out with all guns blazing as he squares up to Lions star Ronan O'Gara.
In today's Daily Record Sean says: "Dan was simply not himself last week at St Helen's and there is no doubt his performance was reflected in the result.
"Every player has an off-day and he can now put it all behind him and return to normal service.
"Dan has been fantastic for us and this is his chance to show everyone how he can have an influence on a game involving so many big-stage guys."
Forwards coach Shade Munro, backed up Sean: "Over the past few years we have responded positively to being up against the more powerful teams in the league - like Munster.
"Not only do they have a whole host of Ireland Test players, they also have a few who will be desperate to put up their hands for the Lions selectors.
"Glasgow's biggest problems have been getting themselves up for the matches against the so-called lesser teams such as Connacht.
"But when a team like Munster come to Hughenden there will be no shortage of motivation."