It is likely to be a case of one in and one out this week at Newcastle in regards to strikers, as BBC Sport reports that the Magpies have agreed a deal to bring Japan worldwide forward Yoshinori Muto in from Mainz.
Mitrovic, in order to complete his part of the deal, left the Newcastle United training camp, in Portugal, to journey to Craven Cottage.
Muto, 26, scored eight goals for the Bundesliga club last season as they avoided relegation by five points.
Muto's reported transfer represents Newcastle's biggest purchase of the summer, and follows the arrival of Swiss worldwide Fabian Schär from Deportivo La Coruna earlier in the week.
Newcastle finished 10th in the Premier League last season.More news: United States won't recognize Crimea annexation; next Trump and Putin meeting delayed
Sky Sports report that a deal has been agreed between both clubs, as well as a contract between Mitrovic and the London side, and now only a successful medical is all that stands between the Serbian striker and a return Fulham.
"Yes. We did this business with Muto because we needed to do something more".
"It means we can bring in another striker and we can be stronger", he said.
Rondon has been linked with a switch back to the Premier League throughout the summer, with Newcastle now making their move.
West Bromwich Albion striker Salomon Rondon is another player of interest to Benitez.