Rangers have completed the signing of Wales midfielder Andy King, who joins on loan from Leicester City.
Joel Pereira featured twice for Manchester United during pre-season, but he will spend the campaign on loan in Scotland with Hearts.
Arsenal have bolstered their defensive options by signing left-back Kieran Tierney from Celtic.
Celtic issued a stern warning to their would-be title rivals on the opening day of the new season in Scotland.
We round up the front and back pages across Europe as Sunday sees the transfer rumour mill crank into gear once again.
Celtic manager Neil Lennon conceded Kieran Tierney's head has been turned by interest from Arsenal, who have had two bids rejected.
Leigh Griffiths marked his return to the Celtic starting XI with a his first goal of 2019 on Wednesday, leaving the striker emotional.
Moving from Bologna to Rangers was "an easy decision to make" for centre-back Filip Helander.
Michael Johnston inspired a Celtic comeback as Neil Lennon's side won 3-1 away to Sarajevo in Champions League qualifying.
Celtic could face a fight to keep Olivier Ntcham after the midfielder affirmed his desire to find a new home.