The Manchester United believes he and his team-mates deserve criticism for the club's poor form more than the beleaguered Dutchman
The Dutchman has been widely criticised for the club's fortunes this season after United failed to make it out of their Champions League group and fell behind in the race for the top four.
Six points separate fifth-placed United from local rivals Manchester City in the final Champions League place - a gap that would have been just three had United managed to beat relegation-threatened Sunderland on Saturday rather than suffering a 2-1 defeat.
And while Van Gaal has shouldered the majority of the blame from media and fans, Rooney believes the players have simply underperformed.
"It’s a very good group of players," said the United and England skipper. "At times it’s been frustrating for us as we’ve under-performed.
"And actually the manager has taken a lot of stick for some performances. It’s down to us, we’re players and we have to perform.
"At times this season we haven’t done that. In terms of that, we’ve probably got off quite lightly and the manager has taken a lot of it.
"But we’re going on the pitch. We have to create chances and win games and we haven’t done that enough this season."
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Despite the club's struggles, Rooney believes United should focus on winning silverware this season, with the club still alive in the FA Cup and Europa League.
"The important thing now, I feel, is to win trophies again this season," he said. "It’s been a few years since we won a trophy.
"This is more or less a new team so for ourselves, as a team, we need to win something. The fans want to see us win something again.
"Obviously the Champions League is massive for this club and it was disappointing to go out of it.
"We’ll keep going in the league, keep trying. But our main aim has to be to make sure we can get in that top four.
"And then the Europa League, it would be great if we can win that. It’s not where we wanted to be at the start of the season.
"But it’s where we’ve found ourselves so why not go and try to win it."
United travel to Denmark to take on Danish champions FC Midtjylland on Thursday before resuming FA Cup duties with a fifth-round tie away to League One outfit Shrewsbury Town.