Armed Forces coach B. Sathianathan was furious with his side's lackadaisical performance despite a 4-0 victory over Perlis in a Premier League match in Kangar on Friday.
Sathianathan fielded an all-local side, resting foreign duo, Marlon Alex James and Bruno Sebastian Marteloto, who both have been playing non-stop since the start of the league.
"We came here and expectedly earned three points. But it is not an achievement as I knew we would beat Perlis easily," said Sathianathan.
"My players only performed well in patches. They need to work harder to improve. I did not like our performance today (Friday)."
"They took things lightly and I fear they would become complacent as the league progresses."
Sathianathan has been unhappy with his team's form since the start of the league and his fears were confirmed when they lost 2-1 to Sime Darby FC last month.
Forces, however, did recover from that defeat and presently lead the standings with 15 points from six matches, two points more than second-placed Pahang.
Veteran striker Hairuddin Omar was in his element on Friday, scoring a hat-trick in the 45th, 72nd and 90th minutes.
Zaquan Adha Abd Radzak was also on target in the 32nd minute.
"As we were sure of winning here, I gave James and Marteloto a break as I want them fresh for the tough match against Johor on Monday (tomorrow)," added Sathianathan.
Meanwhile, Patrick Ronaldinho Wleh's brace earned Sime Darby FC a 4-1 win over USM FC in Selayang.
The Liberian striker scored in the fourth and 65th while Mohd Zamri Hassan and Mohd Shoufiq Mohd Kusaini completed the rout in the 30th and 90th minutes. Edrisar Kaye replied for USM in the 56th minute.
In other matches, Pos Malaysia thrashed Johor Bharu City Council 3-0 while Young Tigers B were held 2-2 by MP Muar.