United are seemingly poised to appoint the 62-year-old Dutchman as the club's new manager following the departure of David Moyes last month, but will have to wait until van Gaal has finished his duties as Holland boss at the World Cup in Brazil this summer.
The arrival of van Gaal at Old Trafford seems like something of a foregone conclusion, but it triggered speculation last week that star striker Rooney would be disgruntled with the former Ajax manager moving to United, as he feared he would be overshadowed by team mate Robin van Persie - who is of course a key player for van Gaal's Holland team.
But Zenden - who featured under van Gaal with both Barcelona and Holland - believes that Rooney will be given just as much of a chance in the side as van Persie will.
“People are jumping the gun,” he said. “Louis van Gaal has said in the past he’s given players too much trust and it has cost him. He’ll do whatever is best for the team and for him. If a player is not right for the job he’ll make that decision. If he decides Rooney is better than Van Persie then he’ll put him in, without a doubt.”
With an announcement over van Gaal's arrival seemingly imminent, many United fans are eager to find out what he's like as a manager, and Zenden also moved to give an insight into his style during his interview with talkSPORT.
“He’s got an ego but he knows what he’s doing,” he added. “It’s his way or the highway. He’s fit for the job though. He’s someone who’s worked in different countries, in different jobs and won trophies. He’ll be good at United because they always play with youngsters and he’s got an eye for them. Some managers don’t, but Van Gaal likes to play local lads."
The final section of Zenden's comments will serve as a huge boost to the likes of Adnan Januzaj and striker James Wilson, who bagged a brace in his first Premier League start against Hull City on Tuesday night.