Mokwena recently announced his departure from Algerian Ligue 1 leaders MC Alger, with a move to Libyan giants Al Ittihad expected to be announced in the coming days.
Mokwena was on his way out of Algeria but was stopped at the Houari Boumediene Airport on Sunday.
The North African country has strict laws regarding taking currency out of the country, and Mokwena was said to be over the limit.
Algerian journalist Nazim Bessol said on iDiski Times that Mokwena's his case was already heard at the Dar El Beida Court, and he received a suspended prison sentence.
"Mokwena was detained after being found with 15 000 US Dollars in cash. In Algeria you can't travel with more than $7 500. But what I know is that he's now been released and is waiting to depart for Libya via Turkey," he said.
"We have just received an update from the court that Mokwena was prosecuted and has been fined and also handed a two-month suspended sentence after being found with 14 200 euros (=$15 000).
"He was prosecuted for attempting to take foreign currency out of the country."
Rulani Mokwena has pushed back against claims that money influenced his surprising departure from MC Alger to Al Ittihad, instead pointing to ambition and purpose.
Mamelodi Sundowns coach Miguel Cardoso has warned his side against getting too comfortable at the top of the Betway Premiership standings.
Mamelodi Sundowns moved two points clear at the top of the Betway Premiership standings after beating Marumo Gallants 3-1 at Loftus on Tuesday.
Nuno Santos has credited a growing sense of comfort and strong support from his teammates as the driving forces behind his recent upturn in performances for Mamelodi Sundowns.
