Chelsea return to action for the first time since winning this summer’s FIFA Club World Cup when they host Bayer Leverkusen in a preseason friendly.

Chelsea have been dealt a huge injury setback after Levi Colwill suffered a knee injury during pre-season training.

“Some of the northern rootworms have created an extended diapause life cycle, so they are able to stay underground for an extra year,” Hein said. “That combats our soybean-corn rotation, so then we ...