Ex-Norway international Riseth spent six months playing under Deila at Stromsgodset towards the end of his playing career and knows just how tough the Hoops' new number one target is.
Riseth said: "Ronny was my coach for six months at Stromsgodset. At the time he was 33 and I was 38.
"But even though he was quite young at that point, he was really, really tough and wanted all the players to work hard on the training pitch and in matches.
"He's tough but fair and always has a good relationship with the players. If they are not playing, he will tell them why.
"But if they don't work the way he wants them to, he will sell them. It's as simple as that."
Delia led Stromsgodset to their first league title in 42 years last season and has now replaced ex-West Brom boss Steve Clarke as the man Celtic want to replace Neil Lennon.
Riseth says his former boss will have no problem making the switch from working in front of a small crowd at his current club to managing Celtic in front of a sold-out Parkhead.
He said: "At Stromsgodset, they play in front of less than 10,000 supporters for every game, but I have seen him take his side to Rosenborg where there are 20,000 shouting at him and it never phases him.
"He is really strong in the head and that will help him if he goes to Celtic.
"The Celtic fans won't know much about him but in Norway, he is a big, big name.
"He won the league in Norway with Stromsgodset last year with just 10 per cent of the budget that Rosenborg could spend.
"With the style of football he plays, he will soon make himself a hero to the Celtic supporters.
"If he can get the team to play the way he wants them, the club's potential will go sky high. He is the man to build the club's future."