75, 80 mins is good enough if he does great within that time. I don't think you need the full 90 mins to collect any matchtime or clean sheet bonuses anyway (60mins iirc).
You can make unlimited changes til the next matchday once you have played your wildcard. If player X gets injured midweek, just transfer him out at no points hit.
GW4:
Man Utd 3-1 Crystal Palace
Aston Villa 2-1 Newcastle
Fulham 1-1 West Brom
Hull City 2-2 Cardiff City
Stoke City 1-3 Man City
Sunderland 0-3 Arsenal
Tottenham 2-1 Norwich
Everton 1-2 Chelsea
Southampton 2-1 West Ham
Swansea 1-2 Liverpool