Celtic and Daniel Kelly still need to do some work to secure the youngster’s long-term future at Parkhead. The 18-year-old’s contract expires in December 2024, creating an unusual wrangle that has yet to be resolved. Manchester United and Tottenham Hotspur have been linked with a swoop for the midfielder. Negotiations are still up in the air between Kelly and Celtic. In addition, Bayer Leverkusen, Como and Bologna have been credited with an interest over the last few months. Fellow academy graduate Rocco Vata departed for Watford last week, earning the Bhoys a small training compensation fee. …