"Simmons is not just a coach. He was one of the best bowling coaches and had a great time with the Indian team. He has a huge wealth of experience and has fine tuned our skills," said Morkel, who is the leading wicket taker in the IPL with 5 19 wickets.
Delhi Daredevils are placed on the top of the table with 16 points in 10 games and are tipped favourites to lift the table.
"Simmons' experience is being reflected on the performance of the team. The fast bowlers are hunting in a pack and we are enjoying each others success," said Morne on the sidelines of a promotional event.
In-form Delhi local boy Gautam Gambhir will take on Daredevils at home on May 7.
"It is going to be a crucial match for us. The clash between the two top teams will always be entertaining. Knight Riders are doing well this season and Gautam is also in good form," he said.
When asked if fans will be divided between two Delhi stars, Morne said, "I don't think so. Gambhir can be the local but Daredevils are the home team."
Daredevils, who are on a four-match winning streak, won't be complacent against a confident Gambhir-led side.
"IPL is a long tournament. Intensity may fall but surely we won't be complacent. The guys are matured and professional. We know how to handle such situations," he said.
With three ex-Delhi players, Gambhir, Rajat Bhatia and Pradeep Sangwan, in the Knight Riders team, Pathan said it would be a tough match.
"There are quite a few Delhi players in the Knight Riders team. It will be a competitive game as some the local boys in the Knight Riders team are well aware of the conditions in Kotla," he said.