Scottish Premiership champions Celtic could let Erik Sviatchenko leave for Besiktas.
Celtic striker and Everton target Moussa Dembele is only going to improve by the season while Arsenal's Olivier Giroud is 30 already.
Brendan Rodgers’s Celtic did not lose a single game in Scotland last season.
Stuart Armstrong has been linked with Premier League duo Brighton and Southampton, with his Celtic contract expiring in 12 month's time.
Celtic striker Moussa Dembele has been linked with a move to Marseille in the summer transfer window.
Celtic signed Olivier Ntcham from Manchester City earlier this month, and his decision is praised by Real Madrid head coach Zinedine Zidane.
Swansea City talisman Gylfi Sigurdsson is closing in on a move to Everton and he could be replaced at the Liberty Stadium by young Patrick Roberts.
Celtic have been linked with John McGinn for a number of months but it appears that Hibs boss Neil Lennon will do everything to keep him at Easter Road.
Barry Douglas joined Wolverhampton Wanderers despite reported interest from Celtic - but he may have been the perfect replacement for Emilio Izaguirre.
Tottenham Hotspur reportedly attempted to nab Jadon Sancho, who has been linked with Celtic, from Manchester City.
The Celtic midfielder is enjoying a fine run under Brendan Rodgers and next season should see him get even better.
The Manchester United player is the ideal replacement for Patrick Roberts at Celtic if the Bhoys could somehow secure a deal.
The Liverpool man has been linked with a move to Celtic and he could help get the best out of a current Bhoys prospect.