Rio Ferdinand believes Kai Havertz has similarities to his former Manchester United team-mate Dimitar Berbatov, but admits the German must become more ruthless.
Havertz arrived at Chelsea from Bayer Leverkusen in an £71million deal in the summer, but has managed just one Premier League goal since joining and has taken a while to adapt to the rigours of English football.
The 21-year-old however set up Hakim Ziyech as Chelsea took a 1-0 lead and a 2-0 lead on aggregate into half-time of their second leg in the last 16 of the Champions League against Atletico Madrid.