Sunday's 4-0 loss to United was Everton's third league defeat on the trot with the 3-0 humbling at the hands of Italy's Atalanta in the Europa League last week adding to their woes. It is up to them to make the right decisions and not be afraid.
He continued: "We now play four times in a row at home in different competitions".
"And if you don't win and you have a big number of players in your squad and you have doubts about how you need to start, the system to play, but that's normal".
Until the 83rd minute at Old Trafford on Sunday Ronald Koeman must have thought his Everton side had turned an important corner, before a late capitulation left it in the English Premier League relegation zone.
Midfielder Gylfi Sigurdsson agreed that Everton showed signs of improvement despite the thrashing and they have the character to turn things around.
"As we saw during the transfer window that just passed, there was a new-found willingness for clubs to keep their best players, even if they were offered money exceeding their realistic valuations".
"I think the Premier League is becoming defensive. many teams try to play with five at the back plus two or three in the middle", he told the club's website. "Of course, we like to improve in what we need".
Everton, 18th in the league with four points from five games, host Sunderland today with the Black Cats also going through a tough period in the second-tier Championship.