The former Birmingham winger joined Leverkusen on an 18-month contract from Leicester in January, but has only scored once in the Bundesliga since arriving in Germany.
The 25-year-old is set to undergo a medical examination at Everton’s Finch Farm training ground on Tuesday ahead of a £ 1.5million transfer to the Toffees.
Everton are expected to complete a trio of signings before the team travel to Florida for a preseason tour, with Asmir Begovic and Andros Townsend also set to join the club.
Begovic has only one year left on his contract at Bournemouth and is expected to arrive at Goodison Park as a cover for England international Jordan Pickford.
Townsend, meanwhile, underwent a medical at Everton on Monday and is expected to join a free transfer after leaving Crystal Palace at the end of last season.
Townsend and new Everton boss Rafa Benitez worked together at Newcastle between March and June 2016 but were unable to avoid the Magpies’ relegation to the championship.
In June, Townsend said Sky Sports News Everton were making the right choice in getting Benitez as their new boss.
“I played under Rafa at Newcastle so I know how good he is manager,” he said.
“He’s good on the training ground. He always tries to work hard and he’s a good man too. Good manager.
“So eliminate the rivalry, eliminate Liverpool-Everton. For reasons on the ground, I think it’s a very good meeting. “