Celtic have already began trimming their bloated squad and have taken one step further to doing so even more. The club have saw Nat Phillips and Yosuke Ideguchi leave during the early part of the January transfer window and now, Rocco Vata could be next up. The highly-rated 18-year-old has been close to a Celtic exit ever since the end of the summer window, with Nottingham Forest and Torino seeing bids for him rejected by the Hoops. Sampdoria showed an interest in him last month but that link has quietened down. Their Serie A rivals Bologna are now leading the charge to sign Vata and according…