Vilakazi recently made his debut for Sundowns in a 3-1 victory over Tshwane rivals SuperSport United in the MTN8 quarter-finals.
And Mosimane was impressed with the performance of the former Bidvest Wits midfielder.
"S'bu had a very good game," Mosimane said.
"First half was a very good game. I like the intensity. I like the pass for the third goal. Normally people will try to shoot because they want to impress but he provided the ball to Khama.
"You can see the quality, unbelievable. He is a very good player. He has given us one more option, more power, plus the CBD upfront. It's beautiful."
Vilakazi joined the Brazilians in July as part of a swap deal involving Mogakolodi Ngele and Cuthbert Malajila.
CBD is a nickname for Downs' influential attacking trio of Leonardo Castro, Khama Billiat and Keagan Dolly.
Get the lowdown from Sibusiso Vilakazi on his high-profile move to Sundowns in the September edition of KICK OFF – on sale now! Download a digital copy