Tottenham boss Jose Mourinho has told Chelsea counterpart Thomas Tuchel he needs to prove his credentials in England.
Ahead of tonight's London derby, Mourinho has warned his German rival, whose last job was with Paris Saint-Germain, that he can only be recognised as a top coach if he is successful in English football.
"What I think makes a coach elite is to be successful in the top leagues, to be successful in leagues in a different dimension," said the Portuguese.
"I am not talking about Thomas, the French league is a very competitive league — apart from PSG because they play in a different league. The biggest challenge for a coach is to work in the best leagues. Our league is the most challenging one.
"He was coming from a league that you cannot compare with the Premier League but he is used to working with players of high calibre, used to important players. He will fit well in a club like Chelsea."
