It’s already been revealed he 43-year-old has scouted matches north of the border.
Click through the list of players in the final year of their contracts in the SPL the Blues could turn to in January, or in the summer.
. Former Celtic and Charlton striker Tony Watt is now at Motherwell.
The in-form striker is out of contract next summer. (Photo by Ian MacNicol/Getty Images) Photo: Ian MacNicol
. John Souttar - Hearts
Position: CB
2021-22 SPL Appearances: 16
Clean Sheets:4
(Photo by Mark Runnacles/Getty Images) Photo: Mark Runnacles
. Jamie McCart - Inverness Caledonian Thistle
Position: CB
2021-22 SPL Appearances: 15
Clean Sheets:5
(Photo by Ian MacNicol/Getty Images) Photo: Ian MacNicol
. Leon Balogun - Rangers
Position: CB
2021-22 SPL Appearances: 11
Clean Sheets: 3
(Photo by Ian MacNicol/Getty Images) Photo: Ian MacNicol
. Coll Donaldson - Ross County
Position: CB
2021-22 SPL Appearances: 2
Clean Sheets: 1
(Photo by Paul Campbell/Getty Images) Photo: Paul Campbell
1. John Souttar - Hearts
Position: CB
2021-22 SPL Appearances: 16
Clean Sheets:4
(Photo by Mark Runnacles/Getty Images) Photo: Mark Runnacles
2. Jamie McCart - Inverness Caledonian Thistle
Position: CB
2021-22 SPL Appearances: 15
Clean Sheets:5
(Photo by Ian MacNicol/Getty Images) Photo: Ian MacNicol
3. Leon Balogun - Rangers
Position: CB
2021-22 SPL Appearances: 11
Clean Sheets: 3
(Photo by Ian MacNicol/Getty Images) Photo: Ian MacNicol
4. Coll Donaldson - Ross County
Position: CB
2021-22 SPL Appearances: 2
Clean Sheets: 1
(Photo by Paul Campbell/Getty Images) Photo: Paul Campbell