Louis van Gaal says he has spoken with Anthony Martial, Morgan Schneiderlin and Bastian Schweinsteiger to check on their "wellbeing".
Talk of cancelling Euro 2016 would be "playing into the hands of terrorists", say the organisers.
England scout Alan Cork said he feared for his life as he watched France play Germany.
French players refused to leave the Stade de France until the German side were safe.
At least 128 people have died in Paris so football is the last thing on their minds.
Three people were killed at the Stade de France as terror attacks claim over 120 lives across Paris.