The Spaniard has not been a regular starter for the Stamford Bridge side so far this season, with an injury hampering his preparations for the new campaign.
The 25-year-old told Sky Sports News: "I am very optimistic and positive. To be honest it has been a difficult position for me with an injury so I could train less than my team-mates, but now I am feeling better and I am looking forward to playing.
"I will try to do my best like in the last two seasons and try to win and score and assist. I think it is very good for the club, for the squad and for the manager.
"I think they are really good, [Kevin] De Bruyne, [Andre] Schurrle, Willian, they are quality young players. Each one has his different position, his different skills, but I think all of them can give us a lot and I think it is better to have a more complete squad."
Chelsea face Everton at Stamford Bridge tomorrow.