Riveiro is set to make his first official appearance at the helm when the Buccaneers welcome Swallows FC in a DStv Premiership opener at Orlando Stadium on August 6.
The Spanish coach signed a three-year deal with the Sea Robbers and is expected to clinch silverware this coming season.
“He is a demanding person," Mosele reveals on Riveiro.
"He wants to play football by attacking when we attack, defend when we have to defend.
"He wants everyone to work hard. He is a great guy.
“Personally, I won’t say there is much that has changed. Pirates are Pirates, you know the culture of Pirates.
"He even said that he won’t change the culture of Pirates. Pirates play football, they dominate games and that is also what he wants."
Pirates finished last season without silverware after Mamelodi Sundowns lifted most major trophies on offer.
"I don’t want to lie, I want to win," Mosele added.
"It’s been a long time without winning a trophy. So what we want to do this season is to win things.
"We are tired of playing for draws."