The left-back was a target for former boss David Moyes at Manchester United over the summer but, unlike team-mate Marouane Fellaini, he remains at Goodison Park after the club rejected all overtures.
|20/1||Everton are 20/1 with William Hill to finish in the top four
"When the window is open I think it's the wrong time to speak about those things and so we hadn't discussed it," Martinez told reporters.
"But, now the window is closed, we are going to look into all the players in the squad and see where their contracts are up to. Then, individually, we will look to address that.
"It would just have created more instability if we had done that while the window was open."
Everton rejected a "derisory and insulting" double bid of £28 million for Baines and Fellaini in August, with the latter eventually moving to Old Trafford for £27.5 million on deadline day.