Jose Mourinho, who was sacked as Tottenham Hotspur boss on Monday, is in the running to be named the next Celtic manager.
Valencia have also been linked with the Portuguese manager, with club owner Peter Lim prepared to dismiss current boss Javi Gracia to bring in the 58-year-old.
Meanwhile, Leicester City manager Brendan Rodgers, 48, has dismissed links to the vacancy at Tottenham.
Tottenham chairman Daniel Levy feared as many as 10 players would quit in the summer if he did not sack Mourinho. Levy was most worried about England’s Harry Kane, 27, and Dele Alli, 25, as well as Wales forward Gareth Bale, 31, on loan from Real Madrid.
Barcelona have offered Manchester City striker Sergio Aguero, 32, a two-year deal. The Argentina forward is available on a free transfer when his contract at Etihad Stadium expires in the summer.
Real Betis are interested in signing 27-year-old Ivory Coast defender Eric Bailly from Manchester United in the summer.
Aston Villa could make a move for Manchester United and England attacking midfielder Jesse Lingard in the summer. The 28-year-old is also wanted on a permanent basis by West Ham United, where he has been on loan since January.
Liverpool want £8.63m (10m Euros) from Porto for the permanent signing of 25-year-old Serbian midfielder Marko Grujic.