With an agent who sounds like he is a character from Harry Potter, Diego Biseswar is looking to Celtic to make an approach The end of the season flushes out all the agents as they try to generate interest in their clients. First out of the traps is Jeroen Hogwerf who is agent of Feyenoord winger Diego Biseswar and he claims Celtic are interested in his client, although they are yet to make a formal approach. Biseswar, who has one year remaining on his deal in Rotterdam, has featured regularly for the Eredivisie club this season. Hogwerf claims the Dutchman's performances have attracted the interest of Celtic. Feyenoord are yet to offer Biseswar a new deal, fuelling rumours that the winger is set for a summer exit. He said: "I know something is happening. When there's smoke, there's fire, but that's all. Something will materialise only if an agenda is drawn up. And as far as I know Celtic have not yet been in touch with Feyenoord. You can see he is a major player, so it's incredible we haven't heard anything. The decision is up to Feyenoord. What is certain is that Diego has one year on his contract and he's still young. We'll see how everything goes."