Romelu Lukaku will be part of Chelsea's first team squad next season.
Chelsea have been linked with strikers Hulk and Edinson Cavani since Mourinho's appointment, but Lukaku insisted he was ready for the challenge.
"I always said my ambition was to play for Chelsea, and now I will go back to Stamford Bridge and try and play even more games than I did at West Brom," he said, after Belgium's 2-1 win over Serbia last night. "If I can score a few early on, it can turn into a really good season for me.
"I have had a good conversation with Jose Mourinho, and I know it's up to me to show I'm worth a place. It is the World Cup next year, and I need to be playing. But if I don't get in the Chelsea team often enough, then I won't deserve to be in the national squad.
"I am not afraid of that. I am determined to succeed with Chelsea next season. I want to prove myself. People will compare me with Didier Drogba, and he was always my hero. But I am my own man, and I want to be known for what I do."