Portsmouth winger Harvey Blair may return to the squad for the trip to Millwall on Saturday (15:00 GMT).
The 22-year-old has missed seven games with a hip-flexor issue and had been due back for the Sheffield United game on Valentine's Day before encountering issues in his recovery.
"He's been in and out," Mousinho told BBC Radio Solent. "He's felt a couple of small niggles that have held him back.
"We will see how he goes today, he's going to do the full training session and we will go from there."
Fellow winger Adrian Segecic should also "be good" for the weekend said Mousinho after spending the Tuesday's win against Charlton on the bench with a dead leg.
Forward Conor Chaplin is due back to training on Saturday after two games out with a groin problem and could make a comeback against Hull City on 28 February (12:30 GMT).
The side will also be without midfielder Andre Dozzell for the trip to the Den, with a return date unknown until Saturday at the earliest, while defender Aji Alese has returned to his parent club Sunderland for treatment on his quad injury.
Winger Josh Murphy could be a week away from a return but an update is needed on his injury before his comeback can be confirmed.
Mousinho added: "If we get good news on the final scan then we will get him back on the grass."
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