US Senator Elizabeth Warren plans to make a rare entrance into the race for Boston City Council and rally for her former law student Michelle Wu and incumbent Councilor Ayanna Pressley on Saturday.

Warren will join Wu at a get-out-the vote rally around 1 p.m. at Judge E.O. Gourdin Park in Roxbury. The senator had been with Wu during her kick-off campaign for the council last year.

Wu, a South End lawyer, was statewide constituency director for Warren’s 2012 Senate campaign and was one Warren’s students at Harvard Law School.

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“I am delighted that Senator Warren will be joining me in the final days of my campaign. She has been a great mentor and friend, and her support of my campaign means so much to me,” said Wu in a statement.

Warren will also join Pressley about an hour later in JP Licks in Jamaica Plain Saturday afternoon.

Warren has long championed progressive, female candidates.