Mbappé's decision comes as no surprise, as rumours of his departure have been circulating since last summer.
Borussia Dortmund will meet either Real Madrid or Bayern Munich who clash in the other semifinal on Wednesday evening
The striker recently informed PSG that he will leave the club upon expiry of his contract
PSG are second, a point behind leaders Borussia Dortmund in a tight Group F, with AC Milan and Newcastle also targeting the knockout rounds with just three points separating the four teams.