Cesar Azpilicueta's header made it 3-0 in the 55th minute, before substitute Tiemoue Bakayoko also scored his first goal for Chelsea when the ball fell to him in the box in the 71st minute.
Michy Batshuayi completed the rout, adding a brace with goals in the 76th and 82nd minutes, the first swith a shot from outside the box and the second bundled over the line.
Chelsea enjoy an early two-point lead atop the group as rivals Roma and Atletico Madrid played out a goalless draw at the Stadio Olimpico.
Saul Niguez squandered a gilt-edged chance at the death as his effort was saved by keeper Alisson before he smashed the rebound against the post to let the Italians off the hook.
Source : KweseEpn