Cavendish, who rode for the Bahrain-McLaren team last season, has 146 career victories but has struggled in recent years. In 2018, he took a break from cycling after being diagnosed with the Epstein-Barr virus for the second time.
“We are happy to have him return to our family, as he is a leader and brings across a wealth of experience that he can share with our young riders, but at the same time we are confident he still has something to give to the team,” Quick-Step chief executive Patrick Lefevere said.
Quick-Step’s lineup includes world champion Julian Alaphilippe and rising star Remco Evenepoel.
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