The 29-year-old has long been strongly linked with a move to Premier League rivals Manchester United.
United had two bids for Baines rejected in the summer and it is reported that they will make a new bid in January.
But Martinez insists that Baines will stay at Goodison.
“I can guarantee he will be here at the end of the season. That is 100 percent,” said Martinez.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?