The former Celtic striker has been making some strange comments on Twitter this weekend. Here, he discussed the Bhoys boss's future.
Indeed, the Norwegian is a popular manager at Parkhead, with many taking to him more than several of his predecessors.
But there is no denying the enormity of the Bhoys' Champions League play-off second leg against Malmo on Tuesday night. And Hartson even thinks it could have a bearing on Deila's future, as he stated on Twitter on Sunday evening:
Huge for Deila.. Celtic will continue to Dominate domestically but at the end of this season if they don't qualify for CL. Will the owners— John Hartson (@JohnHartson10) August 23, 2015
Give him a third crack at the CL next season.. That's what makes this game massive for Celtic's Boss..— John Hartson (@JohnHartson10) August 23, 2015
Hartson has been tweeting strange things all weekend. There is simply no other way to describe them!
On Saturday afternoon, the BBC pundit effectively criticised Newcastle United for earning a creditable 0-0 draw at Old Trafford.
And, here, even if many agree with Hartson that Celtic could end their partnership with Deila at the end of the season should things go wrong, there were plenty who made their feelings emphatically clear to their former forward in response.
Indeed, Deila has the backing of a large majority of the Celtic faithful if their replies are anything to go by...
@JohnHartson10 They won't sack Ronny. He's got the potential to be the best we've had since Marty.— The Weasel (@theweasel1980) August 23, 2015
@JohnHartson10 big fella c'mon we have enough detractors your PMA HH— Michael McGill (@Mikey8bhoy) August 23, 2015
@JohnHartson10 would like to think they would. Squad is stronger and domestic treble should be on. Ronny taken club to a new level.— Celtic Away Pics (@CelticAwayDays) August 23, 2015
@JohnHartson10 Of course they will, he's only been the manager for barely over a year.— Mark O'Neill (@MarkONeill76) August 23, 2015
@JohnHartson10 are you honestly suggesting that European performance alone is how a manager is judged at Celtic?— Michael (@mharte1988) August 23, 2015