And the midfielder whose all-action displays made him an instant favourite with fans last season has spoken about how important that work will be before the big kick-off in the Barclays Premier League on the weekend of August 17/18.
Pre-season includes taking part in the Barclays Asia Trophy with our first match against Sunderland in Hong Kong on July 24. We then play either Manchester City or South China on July 27.
"We meet for pre-season and then go to Hong Kong and that will be important," said Lewis.
"It's a chance to get to know everyone a bit more and (a trip like) that was the only thing I missed when I joined. I just jumped straight in!"
Lewis made 17 appearances last season and loved every minute.
"I really enjoyed playing with the lads," added Lewis, who captained Germany in this summer's European U21 Championships.
"There is so much quality here and it’s a fight for places because the whole squad is so competitive. It’s so enjoyable playing football with these guys."