Chelsea must cough up huge money to land Middlesbrough defender Ben Gibson.
The Mirror says the Blues and Everton are both interested in the highly-rated 23-year-old centre-back as they look to bolster their defensive option in January.
Boro are determined not to lose one of their key stars midway through the season.
Aitor Karanka's side are currently 13th in the Premier League table and have performed well in their first season back in the top-flight.
And Chelsea have been told it will take a huge £35m offer to sign Gibson.