Thank you for finding it!In LeParisien (you need a subscription for the whole article though.) Twitter saying €2m loan and €18m buy out clause.
http://www.leparisien.fr/espace-pre...ssi-un-oeil-sur-imbula-27-06-2015-4897811.php (french)
Edit. Apparently says the buy out clause is obligatory. Might just be wanting to spread our spending out.
