Chelsea boss Thomas Tuchel is excited with the signing of Saul Niguez.

The on-loan Atletico Madrid midfielder could make his debut against Aston Villa.

Tuchel said: "I personally was a bit concerned to go into the season with only Jorginho, Mateo (Kovacic) and N'Golo (Kante).

"Not because of a lack of quality of character – I'm the happiest coach I can be to have these three guys – but it is unpredictable.

"I know the player since many, many years. I was fighting in some other clubs for the player but it wasn't possible. So in the end,when it was possible to have the loan, we were excited by it."