ORLANDO, Fla. — Now that the “Jackson Five” has been set, Knicks brass will attempt to build a bench, starting with signing a backup point guard behind Derrick Rose. Phil Jackson and general manager Steve Mills have spent almost all of their cap space.

Knicks coach Jeff Hornacek said he hopes the choice is a player who can fill in as a starter in case of an emergency. The Knicks are expected to monitor Rose’s knees, perhaps resting him on occasion on the second night of back-to-backs.

Some of the intriguing players still unsigned are Ramon Sessions, Aaron Brooks (who has played in the triangle), Jordan Farmar, Randy Foye, ex-Knick Raymond Felton, Kirk Hinrich, Mario Chalmers and Seth Curry. The Knicks have been told they would need more cap space to ink Foye.

After the Courtney Lee signing at $12.5 million per year, the Knicks will have $617,000 in cap space, and that’s with cap holds on three choice free agents — Lance Thomas, Derrick Williams and Langston Galloway, according to former Nets capologist Bobby Marks, now with the Vertical. Kevin Seraphin’s rights will be renounced in order to sign Noah and Lee.

“It’s going to be that backup point guard — that’s the question right now,” Hornacek said at the Knicks summer league. “That’s one of the tough positions to fill in the NBA. There’s a lot of backups, but you’re always looking. Can that backup step into a starter’s role if something happens to your main guy, your starter? That’s the big thing that there’s not that many of those guys out there that can do that. We got our eyes on a couple who can do that. That’s what we’ll aim for.”

The Knicks will need to renounce the rights to one of the other three to afford a backup point guard. Renouncing a player means the Knicks would be unable to re-sign him by going over the cap. Hence, that player is as good as gone. Williams’ cap hold is the largest at $5.5 million, and the Knicks may be outbid anyway with their non-Bird exception if he gets an offer over $6 million per year.

Despite the empty bench, Knicks brass is loving how free agency has gone so far. Most scouts on hand at the summer league believe the Knicks now are a playoff team.

In the first two days of free agency, Jackson filled the two caverns in their starting lineup. On Friday, they reached terms on a $72 million contract for center Joakim Noah. The next day, shooting guard Courtney Lee agreed to take less than he could have gotten elsewhere to come.

Their starting lineup will be set once the signing period arrives Thursday as the two signees join Rose, Porzingis and Carmelo Anthony.

The Knicks have only two other players under contract — shooting guard Justin Holiday and power forward Kyle O’Quinn. Holiday was the obscure piece obtained in the Bulls’ trade. However, Hornacek said he will compete for a rotation spot.

The Knicks coach claims not to be concerned they will have too weak a bench because of the way he plans to use his three big guns — Rose, Porzingis and Anthony.

“I’m hoping with the three guys, hopefully have two of those guys on the court,” Hornacek said. “It will take pressure off the bench guys to make an open shot. They’re not going to be a real focus necessarily. That always makes it easier for the guys to be comfortable out there. If you’re trying to sub five guys in as a group, it would be more difficult.”

Hornacek said he couldn’t talk specifically about Lee’s addition because of the moratorium but addressed what he expects to get out of the position.

Noah got on the phone with Lee after free agency began, convincing him to take less money to come to the Knicks. The club bumped its offer from $10 million per year to $12 million. A career 38.4 percent 3-point shooter, Lee turned down a $14 million-a-year package from the 76ers.

“Look at our roster, between Carmelo, Kristaps, Derrick, three guys who can put the ball in the hole,” Hornacek said. “We have to have role guys. If they want to stop one of those guys with a double-team, we have a guy who can knock a shot in. That [shooting-guard] spot is important for a guy who can knock down shots, create the space.”

Having extended a qualifying offer, the Knicks can match any offer to Galloway without using cap space. All bets are off with Williams and Thomas. Still, Hornacek believes at the end of the process, when cap space dries up, veterans will be seeking minimum deals.