"Romelu Lukaku had what I call a successful loan," Mourinho told chelseafc.com.
"Sometimes players go on loan and at the end of the season we cannot find one positive reason for that loan, but Lukaku played all the time - apart from when he was injured - so he has minutes of experience in the Premier League in a good team, with a good coach and scoring his goals.
"You can say the same thing about Thibaut Courtois. A successful case of loans are the ones we have to analyse. My final report will have in detail these kinds of cases. That's my job - to analyse things, have an opinion and make my decisions. I have to work with the club and respect the club's decisions, but I know clearly what I would like for next season."
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