Celtic shouldn't sell Jozo Simunovic and keep Dedryck Boyata.
Celtic bolstered their centre-back options with a deal for Marvin Compper last month.
Dedryck Boyata joined Celtic in the summer of 2015.
Dedryck Boyata was questionable for Celtic again on Saturday.
Celtic's Dedryck Boyata chose a bad time to under perform.
Celtic earned a comfortable 2-0 win over Partick Thistle on Wednesday night.
Brendan Rodgers’s Celtic have been linked with Lewis Morgan of St Mirren in the January transfer window.
Brendan Rodgers’s Celtic lost against Heart of Midlothian in the Scottish Premiership at the weekend.
Dundee defender Darren O’Dea defends Celtic trio Dedryck Boyata, Jozo Simunovic and Mikael Lustig.
Dedryck Boyata and Jozo Simunovic were poor for Celtic on Sunday.
Brendan Rodgers' Celtic side extended their lead over Mark Warburton's Rangers to 25 points on Wednesday and Bhoys supporters are showing no mercy to one particular Ibrox star...
Manchester City have allowed another talented Belgian international to move to Celtic, with Dedryck Boyata completing a permanent transfer on Tuesday.
The 24-year-old has come in for his compatriot at Celtic Park, and is more than able to fill his boots according to O'Halloran.