With five games remaining, fifth-placed United are still in contention for a place in the top four of the Barclays Premier League but do need either Manchester City or Arsenal to slip up.
magistoX obra Because of that, Van Gaal knows his team can ill afford any mistakes themselves and believes three points are essential as Crystal Palace visit Old Trafford on Wednesday.
Van Gaal said: "I have always an eye on the schedule of my team and I have to look if the load is not an overload for players.
"But this game against Crystal Palace is very important. We have to win, we need to win, otherwise we cannot close the gap.
"You can only give pressure by winning, so we can only look at ourselves."
United face Everton in the FA Cup semi-finals at Wembley on Saturday but Van Gaal has had to put that glamour occasion to the back of his mind.
superfly mercurial camo The Dutchman said: "For us it is too important to rotate because of freshness for the semi-final. For me, now, the most important thing is to beat Crystal Palace. To speak about the semi-final against Everton isn't appropriate."
Van Gaal feels it is likely that, if his side can keep winning, the chance will open up for his side to achieve their top-four goal in what has been an unpredictable season.
kaiser 5 cleats He said: "I cannot predict, that's why you have to win your own games and then you shall see, but the experience in the Premier League is that our competitors are losing also."
Van Gaal, speaking at his pre-match press conference, was unwilling to discuss further criticism of his side's playing style.
sale nike elastico cleats United laboured to a 1-0 win over doomed bottom side Aston Villa last weekend.
Asked about this issue, which has been a recurring theme throughout the season, Van Gaal said: "The most important thing is to win this game.
"I have already explained why we must win to close the gap, otherwise the gap is too big for the amount of matches we have to play."
Captain Wayne Rooney is hoping to continue after playing 67 minutes against Villa in his first start since recovering from a knee injury and coming through unscathed.
Marcus Rashford, who has scored seven goals since bursting onto the scene in February, again seems likely to feature with Van Gaal having eased the teenager's training load to avoid fatigue.
He told MUTV: "I changed him after 70 minutes (against Villa) and that is also to give him a little bit of rest. He didn't train the day after and also the day after that he didn't train.
cheap messi soccer cleats "I want to keep him fresh because he is in the momentum of scoring and that is very important for him but also for the team. That is why I don't rotate him."
Left-back Luke Shaw has delivered a positive update in his rehabilitation from the double leg fracture he suffered last September, posting online that "training is going really well."
Van Gaal, however, does not want to rush the 20-year-old and points out he still has some way to go.
He said: "He's very positive. He's going great, I cannot deny that. He's training on the pitch. Now he's training with the physiotherapists, and he has to train with the football coach and that's still not happened."
