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Everton manager Ronald Koeman says a deal for Manchester United midfielder Juan Mata is "possible".
Everton are understood to have tabled a £20million offer for Mata, who played under Koeman at Valencia in 2007-08.
New Red Devils' boss Jose Mourinho allowed Mata to leave Chelsea and join United for a fee of £37.1m in January 2014, with the Portuguese thought to be unhappy with the Spanish World Cup winner's defensive contribution to the team.
Everton, buoyed by the additional funds provided by billionaire shareholder Farhad Moshiri, are keen to sign the 28-year-old, whose contract expires in 2018.
When asked for an update on Everton's transfer business, Koeman told a supporter: "We are working hard but we will get some good ones."
After the fan asks whether Zenit Saint Petersburg's Axel Witsel and Mata will be moving to Merseyside, the former Southampton boss replied: "It's possible."
Mata, who is United's second most expensive signing ever behind £59.7m man Angel di Maria, has scored 26 goals in just over 100 appearances in the last two and a half seasons at United but is likely to play second fiddle to new signing Henrikh Mkhitaryan from Borussia Dortmund next season.