Bayern Munich on Friday threatened Canada Soccer with legal action after defender Alphonso Davies returned from the March international break with a torn anterior cruciate ligament.

Bayern Munich full-back Alphonso Davies has been ruled out of the club's "upcoming games" with a hamstring injury, the German side announced on Sunday.

Alphonso Davies is on his way to Qatar to join his Canada team mates for the World Cup, coach John Herdman said on Thursday, but may not be fit to play in the team's opener against Belgium.

Alphonso Davies' unlikely path to spearheading Canada's first World Cup campaign in nearly four decades began in a West African refugee camp where children's dreams are eclipsed by the need to survive.

Bayern Munich defender Alphonso Davies feared he might not play again after doctors were unable to give him a timeline for his return when he was sidelined by a heart problem last season.