A first-half brace from Bongani Ndulula added to goals by Goodman Dlamini and Thokozani Mshengu was enough to ease Usuthu's relegation fears in KwaMashu after they moved on to 32 points in 12th place, and were mathematically safe from the drop.
“It was a huge win for us,” the Rosslee said. “There’s no time to celebrate because by the time you finished your game or your drink, you’re already on your way to your next game or next party.
“So we’ve got to make sure we’re professional about what we do and focus now on the next game against Wits.”
Rosslee celebrated the rewarding of a new contract by his employers last week after steering the club clear of the relegation zone since taking charge last December.
“This is not done and dusted,” he explained. “I want to finish the season on a high and start the new season in a good frame of mind.
"I want to see winners, good positive players with a winning mentality.”
Rosslee also lauded the contributions of Ndulula, a player who netted his first goals for the club since his high-profile January arrival from Soweto giants Orlando Pirates.
“He was fantastic considering he has hardly played much,” the coach said.
“He showed some great touches. There was some great footwork to get the penalty for us and the other finish was sublime, so a great performance from him and all-round a great effort from us.”
Leopards had played most of the game with 10 men following the 32nd-minute dismissal of Djunga Munganga and the result meant they ended the fixture bottom of the log and with three tough games to follow - Mamelodi Sundowns, Orlando Pirates and Free State Stars.
“Today we played badly and conceded very disappointing goals,” coach Sunday Chidzambga said.
“It was very difficult to come back from conceding three goals in the first half and being a man down.
“So I think we will have to go back to the drawing board and start afresh for the next three games.”
He was not fazed by their tough run-in, saying that destiny remained in their own hands as they currently have 23 points and a game in hand over Chippa United (24) above them.
“There are no easy matches in the PSL. All the games are difficult and you just have to try and fight.
"We can’t give up. We have to dig very deep and try.”