The Knicks are banking on Marcus Morris being better than his word.

Just five days after Morris verbally agreed to contract terms with the Spurs, the veteran forward officially reneged on his commitment Thursday and now plans to sign a one-year, $15 million deal with the Knicks, according to multiple reports.

Morris, a 29-year-old who averaged 13.9 points, and 6.1 rebounds while shooting 37.4 percent on 3-pointers with the Celtics last season, originally agreed to sign a two-year, $20 million deal with San Antonio — a team that hasn’t missed the playoffs since 1997 — but now is opting to join a franchise that hasn’t made the postseason in six straight seasons. His motivation is believed to stem from what is expected to be a larger payout by re-entering free agency next summer, while also commanding a higher salary this coming season.

“I had to make this decision based on the best situation for me and my family,” Morris told The Athletic. “This is no knock on the Spurs. I have respect for them.”

The Spurs moved on and will reportedly sign Trey Lyles to a two-year deal, but San Antonio lost even more than Morris. In order to use the full $9.3 million mid-level exception on Morris, San Antonio cleared space by trading sharpshooting forward Davis Bertans to the Wizards and reworking a deal with former Nets forward DeMarre Carroll, who signed a two-year, $13 million contract after originally agreeing to a three-year, $21 million deal.

To land Morris, the Knicks backed out of a deal of their own.

After agreeing to a two-year, $21 million contract with Reggie Bullock, the Knicks discovered a medical issue with the 28-year-old guard, halting the deal. Bullock, dealing with plantar fasciitis, is reportedly still expected to sign with the Knicks on lesser terms.

Though the Knicks have already signed three power forwards (Julius Randle, Taj Gibson, Bobby Portis) — along with guards Wayne Ellington and Elfrid Payton — in their disappointing offseason, the 6-foot-9 Morris is capable of sliding over to small forward, which could threaten the playing time of second-year lottery pick Kevin Knox.

Morris, a 2011 first-round pick (14th overall) out of Kansas, will provide a tough, vocal and experienced presence on David Fizdale’s young roster and has averaged double-digit points the past five years. Should the Knicks fail to contend for a playoff spot once again, the stretch-four — a career 36 percent 3-point shooter — could be a popular target for contending teams near the trade deadline.

Playing in Houston, Phoenix and Detroit during his first seven seasons, Morris was bounced in the first round of his only two playoff appearances, but a 2017 trade to the Celtics allowed the Philadelphia native the greatest success of his career, playing a key role on a team that fell one win short of the 2018 NBA Finals. This past season, Morris became a regular starter and was the most consistent player on a roster that never reached expectations.