There were a few bemusing moves made by Chelsea in the summer transfer window just ended, but perhaps none so head-scratching as Jeremie Boga's loan to Rennes. Not that we didn't expect the highly promising 18-year-old to hit the loan circuit, but the reports of the Ligue 1 club successfully negotiating a buy-option certainly caused a bit of concern. Had we already given up on Boga? Was the kid unhappy for whatever reason? Did we at least include a buy-back?

While those questions are either unfounded or unanswerable at this time, one thing seems certain: the buy-option is very high. How high? A local source claims €40m.

One source, absolutely no idea how accurate it might be, suggesting that Boga's 'option to buy' at Rennes is €40m. http://t.co/CKjF7qqm1X — Chelsea Youth (@chelseayouth) September 2, 2015

That is indeed very high, perhaps prohibitively so for a mid-table Ligue 1 side. Of course, Rennes are owned by a multi-billionaire, but unlike other multi-billionaires, he doesn't seem too keen to waste his money on football. For what it's worth, the report does not seem to expect the buy-out to be met, even if Boga does really well. Which, we all assume, he will. He is pretty darn fantastic already, after all, and should only get better.