LONDON: Chelsea midfielder Kai Havertz was left out of their Champions League squad for the match against French side Stade Rennais after testing positive for COVID-19, manager Frank Lampard said before Wednesday's match. The 21-year-old German, who joined Chelsea from Bayer Leverkusen in the close season for a reported 71 million pounds ($92.24 million), is self-isolating. Havertz has scored four goals in 10 games for the London club in all competitions this season.