Burkina Faso captain Bertrand Traore has deplored as "a scandal" coronavirus testing procedures at the Africa Cup of Nations after up to five players and coach Kamou Malo tested positive in the run-up to Sunday's opener against hosts Cameroon.
Premier League: Manchester City, with three matches to play, are now 10 points clear of Manchester United, who have four games left.
Bertrand Traore, who was handed his Chelsea debut by Jose Mourinho in a Champions League game against Maccabi Tel Aviv in September 2015, is Lyon's second summer signing.
The Burkina Faso international, who arrives from Association Jeunes Espoirs De Bobo-Dioulasso, spent time on trial with Chelsea during their close-season tour of Asia this year, notably scoring against Malaysia and Indonesia.