Liverpool has been tracking Tielemans for a while already. He's a complete midfielder and would be a welcome addition, Liverpool needs another senior centre mid. Milner is leaving next year, Oxlade-Chamberlain or Keita will probably be sold as well.
Leicester City would be stupid to place or let go of Teielesman; he has been a brilliant player for the Foxes, but who doesn't want to play in a big team? If Liverpool provides a good enough sum of money, they might be able to persuade him, but I doubt Leicester will let him leave so easily. I can't seem to discover any relevant news in the media, so if there is an agreement, it will be in the summer. Miner and Oxlade are likely to depart in the summer, while Keita is unlikely to do so.
Regarding Vlahović - insane money. I feel Juventus is making a huge mistake here but let's wait and see. Their priority should have been trying to keep Dybala.
Dybala isn't on good terms with Juventus management and isn't willing to sign a new contract, so it'll only be a matter of time before we see him in a different club's jersey. As for Vlahovic's transfer fee, it's a little high, but he's one of the hottest prospects in Europe right now, so the risk is worth taking at that price. If he leaves it up to chance, Juventus will gain more.