Here we are, 18 months after he was supposed to make his Chelsea debut, and Dutch centre-back Xavier Mbuyamba has finally been unleashed.
The 19-year-old was supposed to join up with Chelsea in the summer of 2019, only for the transfer ban to put an end to that. Mbuyamba joined Barcelona instead, but jumped at the chance to finally move to Stamford Bridge last summer just one year on.
Then he suffered a nasty knee injury in just his second training session and was forced to watch on from the sidelines until Monday's Under-23 meeting with Southampton.