Celtic winger Scott Sinclair seems to have impressed Scott McDonald.
Andrew Robertson failed to take his Premier League form into the international break, with Scotland losing against Israel.
Celtic have reportedly seen a bid rejected for Aberdeen's McKenna.
Brendan Rodgers’s Celtic drew with Motherwell in the Scottish Premiership on Wednesday.
Pedro Caixinha’s Ibrox side Glasgow Rangers lost against Motherwell in the Scottish League Cup.
Pedro Caixinha’s Glasgow Rangers won against St Johnstone, thanks to goals from Ibrox stars Carlos Pena and Graham Dorrans, with defender Bruno Alves playing well.
Rangers look set to sign midfielder Ryan Jack on a free transfer.
Aberdeen boss Derek McInnes has been linked with a potential move to Scottish Premiership rivals Glasgow Rangers.
Here is the latest news involving Celtic and Glasgow Rangers almost a month before the transfer window reopens.
Matt Ritchie has been criticised by former Scotland defender Willie Miller.
Celtic played out a 2-2 draw with Fenerbahce in the Europa League on Thursday evening.