Yannick Bolasie suffered a knee injury last season, but he is looking forward to learning from the English forward Rooney.
"There are some top quality players that have come in, especially Rooney, who is world class. He will bring a leader's mentality and it will be good to learn off him", he said.
Former England captain Rooney returned to Everton after long 13 years and was Koeman's sixth signing in the current transfer window.
"The signings we have made have definitely made the team stronger. The competition for places is going to be strong, but that is what I live for and I am looking forward to fighting for my place. It will bring another level to my game", the Democratic Republic of Congo international added.
At the moment, Everton are in Tanzania to play a friendly against Gor Mahia FC on Thursday.