The Celtic boss wants the Swede to put his goalscoring troubles out of his mind.
When you're under-performing in your job, the last thing you'd want is a boss shouting the odds, telling you what's what and giving you strict sanctions and warnings.
The Norwegian doesn't want to sanction Guidetti, nor does he want to give him a hard time. Instead, the Celtic boss has told him he simply needs to stop thinking about his problems - and they will heal themselves.
Guidetti made a tremendous start to life in Scotland after joining Celtic on loan from Manchester City.
But the 22-year-old has since endured a barren run in front of goal, despite recently registering two assists for the Bhoys.
"He has to stop thinking about it and he will score goals as well. Because you have to think of the process, not results. Goals come as a consequence of good processes," Deila is quoted as saying by the Mail.
"That is maybe the most important thing I have to try and get into this culture. Everything I hear is about results but you have to think how to get those results."
Celtic face Serie A side Inter Milan in the Europa League next week and how Deila would love a fully firing Guidetti back for that tie.
The Norwegian does have plenty of other options, however, and first Celtic have to deal with St Johnstone away from home later today.