Birmingham City co-owner David Sullivan has revealed Borja Oubina's knee injury has cost the club big.

"The fans say you haven't spent enough but what they don't see is that Oubina was £2m," Sullivan told the Guardian. "They say you just loaned him from Celta Vigo. Well, we did, but we paid £1m a year to loan him. He's on £1m a year and we paid his agent £200,000 so that's £2.2m gone."