Koeman has admitted he wants to manage Barcelona one day but who could replace him at Everton?
Franciscus "Frank" de Boer (born 15 May 1970) is a Dutch football manager and former player, who is currently the manager. He spent most of his professional playing career with Ajax, winning five Eredivisie titles, two KNVB Cups, one UEFA Cup and one UEFA Champions League.
De Boer clearly isn't afraid of publically slamming his charges - but what effect would this have had at Rangers?
Martin Jol is reportedly not in line to become the next Rangers manager.
Glasgow Rangers are currently looking for their next manager, and Lorenzo Amoruso has issued his old club some advice.
The Dutchman remains on the market, with Rangers reportedly keen on taking him to Ibrox.
Several of the names linked with Glasgow Rangers are now being touted as potential contenders for the Leicester City job.
The Dutchman was heavily linked to Newcastle United in 2015 - only for Steve McClaren to send them on a downward spiral that resulted in their relegation.
Liverpool wanted to bring Frank de Boer to Anfield five years ago, but he ultimately decided to stay put.
Glasgow Rangers are still looking for Mark Warburton's permanent replacement, and Sutton has offered them some advice.
Frank de Boer has been linked with replacing Mark Warburton at Glasgow Rangers.
A Dane, a Belgian and three Dutchmen who could be delighting crowds next season at Tottenham Hotspur.
Daley Blind gave Spurs a glimpse of what they could enjoy under Frank De Boer with the Ajax player filming the club’s title celebrations for YouTube.
Ronald de Boer believes that his brother Frank’s familiarity with some of the Spurs players will be key to him becoming successful at White Hart Lane.
Wolverhampton Wanderers have sacked manager Walter Zenga, and are searching for a replacement.
Ibrox side Glasgow Rangers' current boss Mark Warburton is under pressure.
The poll was conducted in the days before Glasgow Rangers announced they were looking for a new manager.
Gary Medel was relatively well behaved during his brief stay in Britain, but he's back to his old ways in Italy.
Rangers parted ways with manager Mark Warburton on Friday evening.
Many Rangers fans would love to see Frank de Boer return as the club's manager.
Frank de Boer has been linked with taking charge at Newcastle in the summer.