LAS VEGAS — The Knicks have announced the signing of five players, but not shooting guard Reggie Bullock, whose signing is on hold.

An NBA source indicated a red flag with his physical has delayed his signing. Bullock’s contract terms were being reworked as a result, according to sources. There is concern Bullock’s health would affect his ability to play the entire season.

The Knicks had agreed to sign Bullock to a two-year, $21 million deal before the health issue arose.

Bullock was bothered by plantar fasciitis last season, limiting him to 63 games, and that is a lingering issue that ultimately could lead to surgery in some cases. The 27-year-old averaged 11.3 points and shot 37.7 percent from 3 last season.

Bullock’s agent David Bauman told The Post the sides are “working toward a deal,” calling president Steve Mills and general manager Scott Perry “mensches.”

If the Knicks back out on Bullock or sign him to the minimum, they would have $14.8 million of cap space left and the Knicks have turned their attention toward forward Marcus Morris, who played for the Celtics last season.

According to ESPN, Morris could renege on his two-year, $20 million deal with San Antonio in an unusual move considering the Spurs traded Davis Bertans to open cap space for Morris. The Knicks have offered Morris a one-year, $14.8 million contract, according to Yahoo Sports.

Yahoo reported the Spurs are still “optimistic” they will sign Morris, though the team has reached out to other power forwards.

Even without Bullock, the Knicks are still stocked at shooting guard as they also signed Wayne Ellington, the team announced Tuesday. Also officially announced as Knicks were Taj Gibson, Elfrid Payton, Bobby Portis and Julius Randle.

“We’re thrilled to welcome Wayne, Taj, Elfrid, Bobby and Julius to New York,” Perry said in a statement. “Collectively, we’re adding a mix of extremely talented and experienced multi-dimensional players who will improve our team as we continue building out a deep and versatile roster. These players are all tough-minded, motivated and ready to compete, and we’re excited to have them as part of the Knicks family.”

The Knicks had hoped to net Kevin Durant and Kyrie Irving with their cap space, but that failed to materialize and they quickly turned to Plan B in agreeing to terms with six players in the first 20 hours of free agency.