Chelsea boss Thomas Tuchel says his players «dug in» and «did what was necessary» as they eased into the UEFA Champions League quarter-finals with victory in Lille. Despite falling behind on the night to a Burak Yilmaz penalty, the visitors turned things around either side of half-time thanks to goals from Christian Pulisic and Cesar Azpilicueta. Ad/> The build-up to the game had been overshadowed by the ramifications caused by Roman Abramovich's ownership of the club, but there were no signs of distractions on the pitch as Chelsea brushed aside their Ligue 1 opponents 4-1 on aggregate to advance in Europe.