By North-west correspondent Alex Stevens

Joey Barton has described Ronald Koeman as a “superb appointment” by Everton who will revolutionise the club.

The Merseysiders confirmed on Tuesday morning that the Dutchman is the club’s new manager after signing a three-year contract.

Koeman, who had one year left on his contract at Southampton, replaces Roberto Martinez, who was sacked last month.

Rangers midfielder Barton took to Twitter on Tuesday to not only back the decision of the club but also gave his verdict on what makes Koeman special.

The former England international, 33, said Koeman was the “best available in current market” and is a “serial winner whose habits will improve EFC no end”.

Everton chairman Bill Kenwright claimed on Tuesday that Koeman was the club’s No1 target as soon as they embarked upon the pursuit of a new manager.

The 53-year-old will be joined at Goodison Park by his brother and assistant manager Erwin plus fitness coach Jan Kluitenberg.

Martinez, who had three years remaining on his contract, led Everton to the semi-finals of the FA Cup and League Cup this season, but their poor league form – they finished 11th in the Premier League – ultimately proved his undoing and he left after nearly three years at the club.

The appointment ends Koeman’s hugely successful two-year spell on the south coast, where he twice broke Southampton’s Premier League points record.

The south coast club finished sixth in 2015-16, taking Saints into the Europa League.

In other Everton news, Koeman has already shortlisted a Premier League defender to be his first signing at the club.