According to the Scottish Daily Mail (p77), Dundee defender Jack Hendry and St Mirren winger Lewis Morgan were both in the stands to watch Celtic lose 1-0 to Anderlecht on Tuesday night.
The Bhoys fell to a defeat in their final Champions League group game of the campaign, as Jozo Simunovic's second half own goal handed Belgian giants Anderlecht a narrow win.
Celtic are still through to the Europa League after finishing third in their group, and manager Brendan Rodgers may be looking to bring in some new faces in January to boost his options.
Now, the Scottish Daily Mail (p77) report that two potential signings were in the crowd on Tuesday night, as Dundee defender Jack Hendry and St Mirren's Lewis Morgan were both in attendance.
Centre back Hendry, 22, has thrived for Dundee since joining from Wigan Athletic over the summer, even drawing praise from Bhoys boss Rodgers after a superb performance against Celtic earlier this season.
With Dundee needing cash, Hendry could be sold to raise funds in January, though the Daily Mail also note that Crystal Palace, Newcastle United and Southampton are also keen to sign the former Partick Thistle man.
Meanwhile, playmaker Morgan has been excelling with St Mirren since leaving Rangers in 2014, notching 10 goals in 46 games last season as well as 10 goals in 21 outings this season, drawing major interest from Nottingham Forest and Preston North End too.
Given that his contract is coming to an end in 2018, Celtic appear to be positioning themselves at the front of the queue for his signature, and given that both players were at last night's game, it seems that the Bhoys are edging towards a double signing.