Mvala won the club's Player of the Season award in 2017/18, scoring 12 goals in 28 games for the National First Division champions.
Namibia international Peter Shalulile was the joint-top NFD scorer with 15 goals alongside Black Leopards' Mwape Musonda, winning his club's Players' Player of the Season accolade last term.
“No, we are not selling them ... we are not selling anymore,” Highlands director Larry Brookstone tells KickOff.com ahead of the side's immediate return to the topflight following their ill-fated campaign in 2016/17.
“We told everybody that there’s nothing for sale. Doing so, it’ll help us tremendously.
“We've really got some good players, young players, exciting players and I’m pretty sure they’ll come through.
“Our players are on really good, long-term contracts.
“We are not in a position to be selling players.”
He adds: “Financially we are very stable and there’s nothing for sale at Highlands Park.”