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Chelsea boss Frank Lampard has warned new additions Edouard Mendy, Thiago Silva, Havertz and Timo Werner of what is expected over the festive period.
The game against Everton on Saturday at Goodison Park is the start of a busy Christmas and New Year schedule that will see the Blues play five games in 17 days.
“Mentally it will be a different challenge for them,” Lampard said.
“But if you sign up to come to the Premier League, which for me is the greatest league in the world, they have to be ready for that mental challenge.
“At the minute, I see a squad that is very focused going into this period.”