Moriri has not seen much action since Mosimane's arrival at Chloorkop, and speculation has been rife that the former Bafana midfielder could face the axe at the end of the season.
However, Mosimane has assured Moriri that he will remain at Sundowns despite not enjoying regular game-time.
"I have 31 players and cannot play all of them at the same time," 'Jingles' tells KickOff.com.
"I have spoken to Surprise at training and made him understand that his time will come. He is always first at training. He has a good attitude and leads by example.
"To me Surprise is a legend and as long as I am still at Sundowns he will remain at Sundowns."