Celtic have made a move to find Joe Hart’s replacement by sounding out RKC Waalwijk’s Etienne Vaessen this week. The 28-year-old goalkeeper is out of contract this summer and according to Dutch outlet Brabants Dagblad, Celtic have ‘concrete interest’ in Vaessen as the Dutchman fights relegation this season. PSV Eindhoven and Feyenoord are also named as a club who are interested but the Eredivisie title contenders are said to be putting off any transfer talk until at least April as they put their full focus on the league run-in. Interestingly, Vaessen is also said to have an ‘interest’ in a mov…