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Ten Hag was tasked with bedding in more than a dozen new signings before this season, having lost several key players in the summer.<\/p>\n
Florian Wirtz joined Liverpool for a fee rising to \u00a3116m, Jeremie Frimpong also moved to the Reds for \u00a329.5m and Granit Xhaka signed for Sunderland for \u00a313m.<\/p>\n
Defender Jonathan Tah joined Bayern Munich on a free transfer, winger Amine Adli moved to Bournemouth in a deal worth up to \u00a325.1m, while goalkeeper Lukas Hradecky joined Monaco.<\/p>\n
The three most expensive signings in Leverkusen’s history – Malik Tillman from PSV Eindhoven, Jarell Quansah from Liverpool and Eliesse Ben Seghir from Monaco – all arrived this summer for a total of \u00a388.4m (102m euros) plus add-ons.<\/p>\n
“This decision was not an easy one for us,” added Rolfes.<\/p>\n
“We firmly believe in the quality of our team and will now do everything we can to take the next steps in our development with a new set-up.”<\/p>\n
The club did not name a replacement for Ten Hag, saying the “training work would be taken over by the assistant coaching staff for the time being”.<\/p>\n
“We remain committed to achieving our goals for the season – and to do that, we need the best possible conditions at all levels and across the entire first team,” added Carro.<\/p>\n
“Now it’s a matter of fully implementing and utilising these conditions again.”<\/p>\n
Leverkusen, last season’s Bundesliga runners-up, are in the Champions League this campaign – with Manchester City on 25 November and Newcastle on 10 December among their opponents.<\/p>\n
Their first game back after the international break is at home to Eintracht Frankfurt on 12 September (19:30 BST kick-off), a match you can watch live on the BBC Sport website, app & BBC iPlayer.<\/a><\/p>\n<\/div>\n