The former Galatasaray boss believes his side are capable of snatching second spot in their group after winning their last three qualifiers
The Euro 2008 semi-finalists currently sit in second place in their group, with Romania and Hungary also in contention for a play-off spot going into the final matchday.
"We must focus on Netherlands game without thinking of Romania’s game. Our players can manage everything. We have to turn this into teamwork," he told a press conference.
"If the result is not as we hoped, which is also possible, the national team will prepare for European Championship. We will accept this reality.
"We have to achieve balance where defeats or victories do not cause us our sense of reality."
Terim also called on fans to support their team in Istanbul and help them across the finish line against Oranje.
"We are very hopeful as the whole country. Our supporters in the stadium must be very tolerant. We want them to be on the side of our players when they make mistakes," he added.
"People must imagine their targets. We did not forget the good times in Euro 2008. We have to give our best tomorrow. We are aware that our performance up to date has not been good enough."