Schurrle, new signing Diego Costa and defender Branislav Ivanovic were on target as Chelsea started their Premier League campaign with a convincing 3-1 victory at Burnley on Monday.
The London club have been installed as favourites to win the title in Mourinho's second season since returning to Stamford Bridge after bringing in the likes of Costa, Cesc Fabregas and Filipe Luis.
"I enjoyed the World Cup a lot, so I got out of that with a lot of confidence," Schurrle told Get West London.
"I came back to Chelsea, and obviously had a very short break. [At Burnley] I think it was a good start for me, but of course we can be better. And when I am 100 per cent fit, there will be more.
"So there's a lot of work for me, but I'm feeling good. I'm enjoying my game, I'm enjoying being on the pitch.
"I think the whole team played well [at Burnley]. We had a lot of control, passes, good combinations. It was a lot of fun on the pitch."
Didier Drogba can expect another rapturous reception from the Chelsea fans who worshipped him during his first spell with the club, but the striker may have to settle for a place on the bench once again.
Chris Wood's late goal ensured Leicester salvaged a 2-2 draw against Everton in their first game back in the Premier League.
