The National Olympic Committee of Ukraine said he had joined the armed forces in the early days of the war
Rooney rejoined his boyhood club from Manchester United last week on a free transfer after 13 years at Old Trafford.
Everton are touring East Africa as part of their preparations for the upcoming Premier League season after signing a deal with Kenyan betting firm SportPesa to become the club's new shirt sponsor.
The Toffees received a warm welcome after arriving in Dar es Salaam on Wednesday with large numbers of Tanzanian football fans eager to greet Rooney and his new team-mates.
Manager Ronald Koeman has confirmed all players making the trip will play at least 45 minutes in the game against the reigning Kenyan champions, which kicks off at 1700 local time (1400 GMT).
In May, Everton announced they had penned a five-year sponsorship deal with SportPesa to succeed Thai brewing company Chang.
"We're pleased to have secured the biggest commercial partnership deal in the club's history with an ambitious and growing, global company," Everton chief executive Robert Elstone said at the time.
"From the outset we have been impressed by SportPesa and the company's plans for the future. Over the coming months and years we will be working closely to realise our ambitions together."
"We are thrilled to have secured an alignment with Everton, a club weaved prominently throughout the tapestry of world football," added Ivo Bozukov, director of global strategy for SportPesa.
SportPesa, which is looking to increase its visibility through the Premier League, is further strengthening its ties with the city of Liverpool by moving its European headquarters there.
The Kenyan company were Hull City's shirt sponsors last season, but the Tigers were relegated from the top flight at the end of the 2016-17 campaign. SportPesa also has partnerships with Arsenal and Southampton.
The National Olympic Committee of Ukraine said he had joined the armed forces in the early days of the war
The 61-year-old former Manchester United and Everton coach guided West Ham to their first major trophy since the FA Cup in 1980
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Summit brings together more than 8,000 industry leaders from over 100 countries
State Department spokesman says Washington backs a deal to halt the fighting and free hostages
He clarifies that the offer accepted by Hamas is a softened version of Egyptian proposal, which is not acceptable to Israel
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The Kremlin specifies that the exercises are a response to statements by French President Emmanuel Macron and British officials