Chelsea boss Jose Mourinho is impressed by Crystal Palace's deal for Yohan Cabaye.
Mourinho feels the signing shows how difficult the Premier League has become.
Speaking to ESPN FC, he said: "(Yohan) Cabaye at Crystal Palace, a player that left Newcastle two years ago to go to Paris Saint-Germain to get lots of money on a big transfer fee is coming to Crystal Palace.
"The players that are going to Stoke; the players that are going to Everton; with the players that are going to every club in the Premier League it is getting much more difficult."