Greg Bird on Tuesday became the 13th Yankees player sent to the injured list and the 12th currently on it, yet GM Brian Cashman continues to defend the team’s medical and training staff.

In a phone call Tuesday, Cashman said Bird heard a pop while playing Saturday against the White Sox. He was diagnosed with a left plantar fascia tear. Cashman said the first baseman will be in a walking boot for two weeks and then re-evaluated.

When asked if the oft-injured Bird is simply never going to work out for the Yankees, Cashman said: “Obviously the injury history is for the record and every question is fair game. Obviously when you employ a player like that, you give all the treatment possible to try and stay healthy. It is a fair question to ask. Obviously I don’t have an answer. I don’t want to pile on while [Bird] is going through things. We are going to give him the best care and treatment possible.”

Cashman recognized that this latest need to use the injured list is amping the narrative and noise around the Yankees’ inability to keep their players healthy. But Cashman — as he did last week at a news conference following a setback for Dellin Betances — said that he believes in the medical/training people and protocols in place.

The GM said, for example, that injuries to Miguel Andujar (right labrum tear) and Gary Sanchez (left calf strain) both occurred when the players were awkwardly scrambling back to third base and, therefore, had nothing to do with training or medical staff.

He pointed out that CC Sabathia had a heart condition, Jordan Montgomery underwent Tommy John surgery and Betances has a bone spur that has existed in the back of his shoulder since he was an amateur.

Cashman said the only injury he is not at peace with is the lat strain Luis Severino incurred while already on the injured list with rotator cuff inflammation. He said the Yankees cannot document an action during Severino’s rehab forceful enough to create as significant an injury as a lat strain.

Cashman described his medical/training team as “great” and loaded with experience, and called the hospital (Columbia Presbyterian) that the Yankees are associated with “the best in the world.”

The GM said other organizations are regularly trying to poach Yankees medical/training personnel as a way to accentuate their skill and reputation. And he noted, as he has done earlier, that most players (as is their right) go for second opinions to other doctors, and the Yankees’ recommendations are validated in that way.

The Yankees are opening a two-game set against the Red Sox at 6-9. Cashman said, “You have to reconfigure and cope” with the injuries.

He also insisted he is not second-guessing the Yankees’ offseason strategy to spread money around to deepen the roster rather than go for a Bryce Harper or Manny Machado, saying the depth “is paying dividends” with players such as DJ LeMahieu and Adam Ottavino.

When it came to the injuries, Cashman said: “Regardless what has happened, we are more than capable of winning games, and we haven’t.”

When asked if that has dwindled his faith in the roster, Cashman, for the only time, noted the cumulative impact of so many injured list moves, saying: “We have not been in a position to be all we can be. If you want to look at the analytical world, total up how much WAR we have on the injured list. If you want to go scouting and development, check out how many above-average players have not been available to us.

“These are significant players. I can’t answer [about the quality of the team] because we have not been to our team to be judged on. I can’t lose confidence in a team when we haven’t had the team.”