Alderweireld, however, believes Belgium are now finding their feet in France after a losing start to Italy and is confident they get the job done over the Welsh in the final eight, regardless of Bale's presence and the fact their next opponents will be difficult to overcome.
"He's one of the best players in the world, with his all-round game. He is great in everything," he said in the wake of the 4-0 win over Hungary in the Round of 16.
"They are better than Hungary so it's going to be tough to go through.
"That was another good win but we have done nothing yet. We are in the quarter-finals and we have to work hard to proceed, because Wales are going to be tough opponents."
He added: "People expect a lot from Belgium, but we had a bit of pressure on our shoulders after the first game when we lost. We're getting better now, improving with every game."