Mosala and head coach Sammy Troughton formed a great combination to help Callies win promotion to the GladAfrica Championship last season.
The duo also helped The Romans qualify for the Nedbank Cup quarter-finals, where they have been pitted against Cape Town All Stars.
This website can reveal that Mosala has now decided to join the ambitious project at Sekhukhune, who are targeting promotion to the DStv Premiership this season.
"At Sekhukhune whenever the coach asks for something, we provide. Yes, Mr Mosala is on his way to join Sekhukhune United FC," technical director Alex Bapela confirms to snl24.com/kickoff.
Sekhukhune are second on the first division log at the halfway point of the season, just three points leaders Richards Bay.
Sekhukhune United chairman Simon Malatjie
Prince Nxumalo, Tapuwa Kapini and Jabu Maluleke
McClive Phiri shows off a new yellow strip
Siyabulela Shai models the team's new pink jersey
Ntokozo Mtsweni, McClive Phiri and Thabang Mokoena
Tapuwa Kapini wears the grey goalkeeper strip
The Sekhukhune United launch was held at Malonjeni Guest Farm
Sekhukhune United's nine new signings for the 2020/21 season
Ayanda Dlamini, Siyabulela Shai and Yusuf Maart