The Swedish international striker is yet to score in December.
Ronny Deila had a rough start to his Celtic career but in recent months he has managed to rediscover some of the club's best form.
Going into the game with Ross County, Celtic are coming off the back of a Dundee United defeat. However they remain top of the table with 38 points and had won their previous eight SPL matches.
One of the reasons for that form was the performances of John Guidetti. The Swedish striker, on loan from Manchester City, has scored seven goals for Celtic since confirming his loan deal - but he has not found the back of the net since the cup game with Hearts on the 30th November.
And now Deila has a theory behind his four game goalless streak, the speculation that followed his great form.
After banging in the goals early for Celtic he became linked with several other teams from around Europe, including Italian bigwigs Inter Milan.
And Deila believes that speculation has distracted him, as it once did Virgil van Dijk and Stefan Johansen:
"I think he [Van Dijk] has learned a lot from this [being dropped]. It’s not the first time a player has been affected.
"Others have been through these things as well. Stefan Johansen was the same. He came from the Euro finals with Norway two years ago and played so badly for Stromsgodset. I have never seen him so bad because his mind was somewhere else.
"You can see a bit of that in (John) Guidetti now, as well. If he can get his mind right, the goals will come again."
So if Guidetti decides to ignore the speculation and focus on the football, Deila believes the goals will flow once again for this Swedish international.
Hopefully that will not mean he leaves Celtic in a hurry.