The 32-year-old Schär said in a statement from the Swiss soccer federation that he wanted to concentrate on playing for his Premier League club Newcastle.
Los Angeles led by as many as 26 in its fourth consecutive win over Toronto before the Raptors battled back in the second half.
The Pirates posted a 44-30 win over the side from Delhi on Thursday, while U Mumba registered a 39-37 win over the Pink Panthers.
Seven board members quit after an inquiry into ticketing and logistical problems that marred Tuesday's match at the 60,000-capacity Jaber Al-Ahmad International Stadium against Iraq.
UAE's Al-Ain launch their continental title defence as Cristiano Ronaldo looks to add the AFC Champions League Elite trophy cabinet.