Luca Vildoza, the 6-foot-3 Spanish league combo guard, has finally signed his deal with the Knicks, a source confirmed Wednesday.

Once he clears immigration and COVID-19 testing protocols, Vildoza will join the club — perhaps by the weekend.

ESPN reported the deal to be four years and $13.6 million, but most of it is non-guaranteed, according to a source. Vildoza had other offers, sources said, and the Knicks needed to sweeten the deal.

Vildoza, 25, is from Argentina and becomes the second point guard from that country to play for the Knicks following Pablo Prigioni’s successful stint from 2012-15.

Vildoza played for Baskonia this season. According to Spanish reports, the Knicks may have to pay Baskonia $2 million as part of a buyout settlement.

“He’s tough, hard-nosed,” one NBA scout said. “He’s an excellent passer, shooter and was consistent in Baskonia. He has a good feel for the game.”

The Knicks believe Vildoza could help them in the playoffs, but this move is more for the future. Vildoza will play for Argentina in the Olympics as a further means of evaluation, but he’s expected to be on the roster next season. Vildoza likely couldn’t also play for the summer league team because of the time frame.

The Knicks will have a roster spot as Jared Harper’s 10-day contract is being converted back to a two-way deal. The Argentinian was averaging 10.1 points per game in the Spanish league, shooting 37.6 percent from 3-point range.

All the Knicks point guards are impending free agents — including Elfrid Payton, Derrick Rose and Frank Ntilikina. Payton and Ntilikina likely won’t be retained, which gives Vildoza a real shot.

However, the Knicks will enter free agency with $60 million in cap space with an eye on a new starting point guard. Could Vildoza make the transition? Most scouts see him as just a backup player.

The Knicks had an open roster spot after dealing at the trade deadline Austin Rivers, who had left the team following the All-Star break following a falling out with coach Tom Thibodeau over his diminished role. Rivers was waived by Oklahoma City but signed April 20 by Denver, which had lost Jamal Murray.

As reported by The Post, during one game, Rivers didn’t sit on the Knicks bench and he looked uninspired at other junctures while on the bench.

Now Rivers is loving life on the hottest team outside the Knicks.

“I’ve had chance to reflect over the past month,’’ Rivers said last week on Zoom. “When you go through something unintended for yourself, you start asking, ‘Why me?’ You start pointing fingers the other way. As time goes on, you get a chance to look in the mirror and ask: ‘What did I do wrong? What can I do better? Why am I hear in this situation?’ Basketball-wise, no way I felt I should’ve been in this situation.

“My whole pitch to them was positive energy all the time. Whenever my name is called, be in attack mode. When I’m not, support the hell out of these guys.’’