Distin agrees Everton deal
Frenchman Distin, 31, has agreed a three-year deal at Goodison Park subject to a medical.
"All the formalities have been completed. After Sylvain made it clear his preferred destination was Goodison the chairman moved quickly to finalise the deal and Sylvain is now on his way to undergo a medical," chief executive Robert Elstone told the club's website.
Everton, who finished fifth in the Premier League last season, have started the new campaign with two defeats and have been unsettled by Lescott's protracted transfer to City.
Manager David Moyes is also without central defender Phil Jagielka who will not play before October bcause of a serious knee injury, meaning midfielder Phil Neville has had to fill in at the back.
While it is good news for Everton, Portsmouth have lost another first team player following the sale of striker Peter Crouch to Tottenham Hotspur and Glen Johnson to Liverpool.
Djimi Traore, Sean Davis, Noe Pamarot and Lauren also left the south coast club, who have been hampered by a long-running takeover saga that was completed on Wednesday when Portsmouth announced United Arab Emirates investor Sulaiman al-Fahim had bought the club.