"Once you have that knee injury, the knee does feel a little unusual. It's about just getting used to the running," Maguire said of Inglis' torn posterior cruciate ligament.
"They're the sort of things he's probably had over the last few weeks.
"But he ran really well at training yesterday, it was probably the freest I've seen him move." Maguire dismissed the suggestion Inglis was in need of rest, as some pundits and commentators have said in the past few weeks.
"It was a no-brainer for myself in terms of letting him play," he said.
"You've got to remember he's had a month off, so getting a few games into him before finals is a positive for us.
"He's a great player ... and to have him out there brings us great confidence."
On the subject of Souths' potential to win their first premiership since 1971, Maguire said little.
But he didn't attempt to downplay the importance of victory over the Roosters, and the attached reward of the club's first minor premiership since 1989.
"Very much so [it's important]," Maguire said.
"It's a great milestone for the club, if we're able to get the performance right.
"We've got to get a few things right, because over the next month you don't get many chances."
- AAP