The former Liverpool defender says people should get off Van Gaal's back, because United were never going to win the Premier League.
United are currently 4th in the table, just one point off Arsenal in third and five points off rivals Manchester City, who are currently second behind Chelsea.
They are also into the latter stages of the FA Cup, taking on Arsenal on Monday. However, there have been murmurings of discontent from Old Trafford over the style of football the Dutch coached has employed, with former midfielder Paul Scholes a strong complainant, according to BT Sport.
Now, Carragher has said that United fans must be patient with the new manager as there was no chance they’d be leading the title race.
“There was never any chance of United finishing in front of both Chelsea and Manchester City this season,” wrote the Sky Sports pundit.
“The way some people are talking about United at the moment, there seems to be disappointment and mystification that Van Gaal’s team are in the middle of a fight to get into the top four and not perched in top spot, setting an unrelenting pace.”
Carragher says that the amount of money that United spent in the summer should not be part of any debate, as the other teams around them have also spent heavily.
Van Gaal splashed the cash in the summer, bringing in the likes of Luke Shaw, Ander Herrera, Radamel Falcao and club-record signing Angel Di Maria.
The defender turned pundit isn’t convinced by people criticising their spending though, saying they aren’t the only club who spent big.
“United’s spending shouldn’t come into arguments,” added Carragher.
“Manchester City won the title then spent £88m on new players. Liverpool finished second then invested £114.8m. Chelsea have sold well but have paid out £112.8m since last year; Arsenal’s outlay for the same period has been £95m. Van Gaal isn’t the only manager to get financial assistance.”