Rooney rejoined his boyhood club on Sunday from Manchester United and has been named in the traveling squad for the friendly scheduled for National Stadium in Dar es Salaam.
Koeman has now revealed that each of the travelling party will play 45 minutes against the former Kenyan champions. "The most important thing is how we start our pre-season. It is about what we need to do to get to our best at our football and physical levels.
"This is our first friendly and everybody will be involved for 45 minutes in the game. You play football to win and we will do that in Tanzania," Koeman told the club's official website.
Koeman added, “It’s a trip that is not all about football. There is the commercial side as well, which is good for Everton. We will support the Club in what we need to do over there."
The Toffees are in Tanzania as part of their new partnership with sponsors SportPesa, and the players will also be out within the local community getting to know the culture of the East African country.