The Bafana star picked up a knock in the second half of the Buccaneers' 3–0 Betway Premiership win over TS Galaxy last week and subsequently missed the CAF Champions League second qualifying round first leg win over African Stars.
He has subsequently returned to training with his teammates but is unlikely to be in contention when Bucs face the Namibian side at the Amstel Orlando Arena on Friday.
Speaking ahead of the game, Ouaddou explained that Appollis is an important part of his squad and will only return when fully fit.
"I'm happy that he was in training, the target was to see what he can do, in the warm-up to see if he can sprint, it's good news, he said he doesn't feel pain," Ouaddou said on IOL.
"But you must understand Oswin is an important player of the team, they are all Ferraris, we need to take care of the engines very well. I don't want to risk any players ahead of these important games, or burn anything."
Appollis might have to wait until the Carling Knockout Cup clash with Milford on Tuesday to make his Pirates return.
African Stars head coach Gerald Guther says his side will "leave everything on the field," in their crucial CAF Champions League qualifier with Orlando Pirates on Friday night.
Golden Arrows have officially announced that Mandla Ncikazi has rejoined the club as head coach after parting ways with Pitso Dladla on Thursday evening.
Orlando Pirates have revealed they have parted ways with assistant coach Mandla Ncikazi who is set to take over a head coach role with a Premier Soccer League side.
Orlando Pirates will be looking to progress to the CAF Champions League group phase when they face African Stars in their second leg clash at Orlando Amstel Arena on Friday.
