Defender Lamine Moro's late goal was enough to earn Yanga a 1-0 win over Mbeya City FC at the Benjamin Mkapa Stadium in Dar es Salaam on Sunday.
Krmpotic, though, was not completely satisfied ahead of games against Kagera Sugar, Mtibwa Sugar and Coastal Union before the end of September.
After resting most new signings in the disappointing 1-1 draw with Tanzania Prisons on the opening day, Krmpotic made four changes to the starting line-up against Mbeya City FC.
However, Yanga were failing to maintain the flow of the ball and played wrong passes despite dominating possession in both halves.
Krmpotic had to make three tactical changes in the second half.
After another subdued performance, Deus Kaseke was substituted immediately after the restart, Haruna Niyonzima and Feisal Salum were also taken off just after the hour mark.
Midfielder, Carlos Carlinhos, and strikers, Ditram Nchimbi and Yacouba Sogne, were brought in as Yanga tried to be more direct.
Ultimately, Angolan import Carlinhos' set piece bore fruits for Yanga when Moro connected it home five minutes into stoppage time.
Speaking in a post-match interview, the Serbian coach said Mbeya City FC made it tough, although his team’s performance did not meet the required standards.
“Hard game, very hard game, and I know before the game everybody spoke abouth three or four goals, 3-0, 4-0. It is not easy to play with 10 men behind the ball,'' he said.
''It is not easy to create opportunities. I think we attacked for 75 minutes but didn’t score until the last three minutes when Lamine scored.”
“We trained for this situation many times. You must also have patience in the last three minutes.''
''I congratulate my players for fighting but not for playing, I am not satisfied with how my team played. I am satisfied with the fighting, patience and how they gave everything.''
''I need to play quick, one-two touches but today especially the first half we had players making wrong passes and wrong play.”
Yanga, who occupy the sixth spot with four points from two matches, will travel to Kagera for their next league assignment against Kagera Sugar in Bukoba on Saturday.
They will then go to Morogoro to face hosts Mtibwa Sugar before coming back to Dar es Salaam for their fifth league game against Coastal Union.