The Sharks will have to do without former All Blacks flyhalf Tony Brown in their Vodacom Super 14 clash with the Waratahs. Brown is injured.
Brown made his Sharks debut in the 22-20 defeat against the Crusaders, but was subbed after an hour because of injury. He has been playing in Japan for the past 18 months.
Local boy Brad Barritt, who made his debut against the Cheetahs, is the favourite to start at flyhalf in a match the Sharks need to win to kick-start their campaign.
After a surprise tournament opening win against the Chiefs, the Sharks have squandered to big leads to lose to the Cheetahs (by a point) and the Crusaders (by two points).
Muir told Die Beeld newspaper the team had worked hard on eliminating those mistakes. They also need to attack a lead and not defend it.
The Tahs will be without Rocky Elsom, Wendell Sailor and Matt Dunning, with all three suspended. Dan Vickerman is also doubtful, while Mat Rogers is likely to play a role in the second half, having missed the start of the competition through injury.
Muir said he was confident Barritt would be up to the challenge.
“Tony’s injury is a setback, but I have Brad who knows what I expect from a flyhalf. He’s not afraid to tackle his opponents and place them under pressure by playing in their face. He’s also not the easiest player to tackle.”
Waylon Murray looks set to keep his place in the midfield and Solly Tyibilika is favoured to start as openside flank.