Central midfielder Winks played 41 times across all competitions in the last two seasons, but found himself out of favour at the start of this campaign.
Pierre-Emile Hojbjerg, Moussa Sissoko and the rejuvenated Tanguy Ndombele have generally been the preferred midfield trio this season.
But Winks has impressed Mourinho with his attitude and performances since asking for more game time prior in December.
The 24-year-old has played in the last three Premier League games for Spurs after missing each of the preceding eight.
But Mourinho insists there's "no chance" of Winks leaving in January, says the Daily Mail.