Timo Werner hopes to play regularly and make Germany's 2022 World Cup roster.
The 26-year-old was unhappy with his 15 Premier League starts and 4 goals last season.
He believes watching Thomas Tuchel pick Kai Havertz from the bench could end his World Cup hopes.
Lukaku went on loan to Inter Milan this summer, but Raheem Sterling has provided competition.
Werner said, "I could be happy anywhere," hinting he could leave Chelsea this summer.
"I need to play more to be in good shape for the World Cup and to have a chance to play," he told talkSPORT.
"A winter or summer World Cup makes no difference. I should play half or the whole season. I'm unmoved.
"The manager has various ideas, thoughts, and game needs."
"I wasn't in his mind in many games, so I attempt to fix that. It was the same when Romelu arrived last season. Big competition. Same.