Sydney FC coach Steve Corica has blamed the coronavirus and heavy rains for his team's 4-0 thrashing by Ange Postecoglou's Yokohama F Marinos, saying Sydney FC failed to adapt to the pace of the game having not played for 19 days.

The Sky Blues had two games postponed before their defeat in Yokohama on Wednesday night, after their derby against Western Sydney Wanderers couldn't go ahead due to torrential rain. Days prior, their first Asian Champions League match was postponed as Shanghai SIPG could not travel to Australia due to restrictions surrounding the coronavirus outbreak.

Adam Le Fondre and his teammates look dejected during the AFC Champions League Group H match against Yokohama F.Marinos. Credit:Getty Images

Corica says those postponements left his side bereft of the match fitness required to challenge the champions of Japan in Yokohama.

"Full credit to Yokohama, they were very good tonight, they played well, got the goals they needed but I think it showed we hadn't played for three weeks," Corica said.