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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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
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