The Netherlands boss will take over at Old Trafford after the World Cup third-place playoff with Brazil and the Welshman is looking forward to the manager's arrival
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Van Gaal has already made moves to strengthen his squad with the arrivals of Luke Shaw and Ander Herrera - both of whom are likely to make their Old Trafford bows during the Dutchman's first game in charge, against Valencia on August 12 - and Giggs anticipates a title challenge next term.
'I got a taste in the dugout last season and I'm looking forward to working with Louis," Giggs told the club's official website.
"He won't be afraid of taking over at Manchester United. He'll relish it. He has a clear philosophy and he sticks to that. He's been at huge clubs, but in my view this is the biggest.
"It's tough to win the league but that's why we'll try to do."
Van Gaal led Netherlands to the World Cup semi-finals, where they were defeated by Argentina on penalties, and will manage the national team for the final team in their third-place playoff against Brazil on Saturday.