Hamburg sporting director Claus Costa has shed light on the seriousness of Luka Vuskovic’s injury as Tottenham’s medical team remain in contact with the Bundesliga club regarding the centre-back.The Croat has missed the club’s last two games against Stuttgart and Hoffenheim due to a knee problem, and his side have lost both games.There have been mixed reports on the severity of Luka Vuskovic’s injury, which some sources claim is more serious than initially thought.However, other outlets suggest that Vuskovic is only resting as a precaution and that the centre-back is not feeling any pain in his knee.Photo by Lampson Yip/Lampson Yip/Clicks ImagesHamburg director sheds light on rehabilitation of Tottenham star Luka VuskovicIt is unclear when Vuskovic will be back in action, and with HSV fighting to stay in the Bundesliga, they will hope to have him back on the pitch as soon as possible.Claus Costa has now explained that the 19-year-old is suffering from internal bleeding in his knee, which makes it difficult to estimate his exact return date.The Hamburg director told Bild: “A knee sprain or contusion causes internal bleeding. This makes it difficult to control the knee precisely and correctly. That’s something that takes time.“Of course, we miss Luka. Because he’s not on the pitch, he’s somewhat sidelined. We have to be patient and wait until he’s available again.”Claus Costa is optimistic Vuskovic will play again this seasonThe Tottenham medical team are in contact with Hamburg about Vuskovic’s rehabilitation as the centre-back attempts to recover before the end of the season.In fact, reports indicate that Spurs have inserted a clause in Vuskovic’s loan contract which gives them the power to decide when he will play, but Costa remains confident that the defender will feature again this season.He added: “I’m optimistic that he’ll be able to play again this season. If he’s fit to play, nothing can stop him. He’s extremely ambitious and desperately wants to play for us again. That’s why we’re confident.”READ MORE: Yet another Arsenal legend throws support behind Tottenham to avoid relegationThe post Hamburg reveal whether Luka Vuskovic will play again this season after Tottenham talks appeared first on Spurs Web.