Player will drop to 35% max in a game if i am not wrong.(depending on high or low press)So with condition of 75% your team will be ok.
I encourage you to try it out to know if there is any effect.
Below 35% the risk penalty is injuries or red card.
I once powertrain my top scorer not aware that i was having a match. He played with 28+% through the 90th min and towards the end of the game his condition is at 0%.
No injuries or red card infact he score 2 goals and was motm.
Sad i dont hv the screenshot to proof it.

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