That’s according to former Liverpool star Jamie Redknapp.
The Blues extended their lead at the top of the Premier League table on Wednesday thanks to a 1-0 win at Sunderland.
Chelsea have now won 10 games on the spin, conceding just two goals in that stretch.
“I would also look for cover up front. Unlike Costa, Michy Batshuayi doesn’t look the most intelligent of forwards”
Jamie Redknapp on Chelsea’s January transfer window
However, pundit Redknapp reckons Conte needs to add a left-back and a striker to his ranks in January to bolster their already strong squad.
“I’m sure Chelsea would love to find the next Ashley Cole to play in their system as a left wing back, although they are difficult to find,” Redknapp told the Daily Mail.
“Marcos Alonso has done ever so well but it is an area where Chelsea can improve.
“I would also look for cover up front. Unlike Costa, Michy Batshuayi doesn’t look the most intelligent of forwards.
“When Costa is on form he is unplayable – he holds the ball up, scores goals and is a nasty piece of work.
“If Costa gets injured for the rest of the season, you would struggle to see how they would win the League given their back-up options.”