Bratton said the officer who tackled Blake had been put on desk duty while the department reviewed the incident.
"I have concerns about the takedown," said Bratton, adding he had seen a video of the arrest.
"The concern we had: was the force used appropriate, and the initial review — we believe it may not have been," added Bratton, who was appointed by Democratic Mayor Bill de Blasio at a time when he was trying to improve relations between police and minority residents of the city.
Police said Blake, at one time ranked fourth in the world, had been mistakenly identified by a cooperating witness as a suspect in a fraud ring.
Bratton said he was also concerned that no report had been made of Blake's arrest and detention, which became public after the former player reported it to the New York Daily News.
Blake told ABC's "Good Morning America" he decided to go public with the incident after discussing it with his wife and imagining how he would have felt if she had been treated in that way.
"I was furious because I thought about what I would be thinking if someone did that to my wife, if someone tackled her in broad daylight, paraded her around in a busy, crowded sidewalk in New York City with handcuffs," Blake said.
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