Head coach John Herdman says Canada are "doing everything we can" to allow Alphonso Davies to feature in their World Cup opener against Belgium.

"My mission is to make sure he plays at this World Cup, it's a childhood dream for him," Herdman said in Saturday's press conference.

"But I have to say Belgium's another level, we haven't faced a team of that level since we played against Brazil [a 3-2 friendly loss in 2008].

"You need players like Alphonso, whether that's starting, or off the bench. So, we're doing everything we can.

"He's still building towards hitting his top speed. He hasn't hit that top speed yet and when you have hamstring injuries that's always the key moment. That's when the hamstring is pushed to its limits."