The Chiefs have four wins and two losses from their opening six games, which included the gruelling trip to South Africa.
Messam says they were disappointed with their performance against the Sharks.
"It is not acceptable the way we played the game of football. Just the basic errors let us down and we made some schoolboy errors and that is something as individuals we need to work on and take accountability for.
"The culture here and the training environment has always been good but we have had two slip-ups already and we can't afford to have any more. We need to grind out wins in those tight situations."
-The Chiefs have made several changes to their starting line-up to play the Cheetahs today including a new front row.
Pauliasi Manu returns from injury and is joined by Quentin MacDonald and Ben Tameifuna. Tom Marshall comes on to the left wing, Sonny Bill Williams returns to the midfield and Charlie Ngatai is bracketed with Seta Tamanivalu at centre. Andrew Horrell moves to the reserves and is joined by prop Siate Tokolahi and Marty McKenzie.
The match kicks off at 4.30pm.