Johan Djourou has hailed former club Arsenal for the signing of Granit Xhaka.
The midfielder started just two games in the Scottish Premiership this past term.
The Senegalese midfielder was one of few Aston Villa players to have an superb individual campaign despite the horror year at Villa Park.
Warburton has led Glasgow Rangers to promotion and cup success since arriving at Ibrox.
Brendan Rodgers signed a 12-month rolling contract with Celtic.
Nottingham Forest are currently on the hunt for a new manager to take over from Paul Williams.
Rafael Benitez, now at Newcastle United, was sacked by Real Madrid in January 2016.
Rafael Benitez agreed fresh terms with Newcastle United recently.
David Pleat has been talking about Tottenham's transfer plans this summer.
The Croatian had been linked with a move to become the new Leeds United boss.