Deila will meet the Swede's agents in the next few days to discuss personal terms after a £3m transfer fee was struck with his club Manchester City.
The Celtic gaffer said: "There has been some movement on Guidetti.
"Hopefully that's encouraging. If it wasn't, I don't think he'd want to meet us, so it's positive.
"There is no problem with his club Manchester City. It's now about getting the player on board."