"If he is bowling at over 150km/h, as he was in India, then I am sure he will be a great asset for the squad and a fantastic example for our quicks. We want him to help our bowlers, both tactically and physically, as well as talking to the team and sharing his opinions and ideas.
"You only have to look at Steven to know he is a good player. He has a big bounce and bowls a heavy ball. He gives good balance and pace up front. Our bowlers can learn a lot from him.
"His presence alone will also help the maturing of the young fast bowlers immensely. We have two or three promising young quicks in Otago that we believe through natural progression can play first-class cricket soon. It would be invaluable to get Steven's professional opinion on their development," he said.
"Whether that is him passing on the way he trains, his mental processes and the like - we are eager to hear anything that will be beneficial for our players."
The paceman leaves Dunedin on December 4 before joining up with the England squad in the United Arab Emirates for a seriesof three tests, four ODIs and three T20 games over two months.
"We did not actively seek Steven, the player and his agent made him available. There has been a lot of good work done from Otago cricket to do a deal which is not costing a huge amount of money and is good for both parties," said Johnson.
Finn will play 16 days of cricket during his month here.