The Ghana international, who has had two previous spells in Serie A with AC Milan, returns to Italy after just one season in the Bundesliga.
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Mexico's 24-year-old defender Carlos Salcedo poured doubt onto his national team future following El Tri's 2-0 loss to Brazil.
Wolf scored five goals and made nine assists for Frankfurt in the Bundesliga last season and also played a big role in the German Cup-winning team.
Ante Revic shone the brightest as Eintracht Frankfurt stunned Bayern in the cup final. Though he's had a tough career, he will be at the World Cup.
Niko Kovac said "football writes the best stories" after his Eintracht Frankfurt side beat future employer Bayern Munich 3-1 in the DFB Pokal final.
Eintracht Frankfurt pulled off a shock 3-1 upset over Bayern Munich in the final to win their first DFB Pokal since 1998.
Eintracht Frankfurt have announced Adi Hutter will replace Niko Kovac as head coach at the end of the season.
Eintracht Frankfurt have signed Mexican defender Carlos Salcedo on a permanent transfer after a successful one-year loan at the German club.
Boateng, 31, is under contract until 2020 but told reporters news that Kovac would leave at the end of the season was 'a shock.'
Salcedo, 24, suffered his second shoulder injury in the space of a year during Mexico's game against Croatia in March.
Frankfurt have lost three Bundesliga matches in a row, hitting European hopes.
Eintracht Frankfurt coach Niko Kovac got a look at his future workplace but couldn't prevent a changed Bayern Munich team winning 4-1
Another VAR controversy enraged Eintracht Frankfurt sporting director Fredi Bobic during the 1-0 win against Schalke in the DFB Pokal semifinal.
Eintracht Frankfurt sporting director Fredi Bobic has continued the war of words over Bayern Munich's hiring of Niko Kovac as coach for next season.
Eintracht Frankfurt edged Schalke 1-0 away on Wednesday to book their place in the DFB Pokal final against Bayern Munich.
Bayern Munich confirmed Niko Kovac as the club's next manager on Friday but drew sharp criticism from his current employers, Eintracht Frankfurt.
Eintracht Frankfurt manager Niko Kovac will be the next coach of Bayern Munich, according to a report by German newspaper Bild.