The 21-year-old defender has been a strong player for Antonio Conte's side this season, showing up until now.
The new arrangement will keep him at Stamford Bridge until the point when 2022, after he at first marked with the Blues in 2012 and spent the keep going two seasons on loan at Borussia Monchengladbach.
"It feels better than average to sign another agreement and I'm only glad to be focused on Chelsea for the future," Christensen said in a discharge.
"I've played a considerable measure of games, I'm appreciating it at the club and everything is functioning admirably."
Christensen, a Denmark universal, will probably play in the up and coming World Cup subsequent to helping his national team qualify by scoring in a 5-1 play-off triumph against the Republic of Ireland in November.
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