The Celtics scored a 91-85 victory over Portland in the Las Vegas summer league playoffs Thursday night, but more important, it looks like they may have dodged a bullet with Marcus Smart.

The second-year guard sustained two dislocated fingers on his right hand while bracing himself on a fall going for a rebound. Smart stayed on the floor screaming for a few moments and was taken to the dressing room. X-rays were negative, but he needed five stitches.

“They just said dislocation,” reported Celtic assistant coach Micah Shrewsberry, who is running the team in Las Vegas. “They’re just going to send [the X-rays] back to Boston and let our doctors take a look and just confirm what they saw here.

“When you first hear screams, it’s not always the best feeling in the world. He’ll be OK. He’s in good spirits in the locker room. He’s got the pictures on his phone. He was joking with the guys, showing it to them. And just like the warrior that he is, he comes back out to the bench and is leading the cheers and talking on defense.”

Smart did not address the media, but he tweeted that it was just a minor setback.

• Jordan Mickey will be on the Celtics roster this season – barring an unforeseen trade – but the contract that gets him there was very much in question Thursday.

Sources told the Boston Herald there had been a breakdown in negotiations on a deal for the second-round draft pick, who has been extremely impressive the last two weeks.

According to sources, the Celtics were offering the No. 33 selection a four-year deal – two guaranteed and two at the team’s option – that was the richest given a second-round pick.

League sources said Mickey was looking for a shorter-term commitment and it appeared neither side would move.

By the afternoon, however, the sides were back discussing a longer-term arrangement.

“I’m comfortable,” said Mickey. “I’m still feeling good about it. I’m confident everything will work out.”

• James Young was back on the court Thursday, scoring nine points in 22 minutes. He missed the first three games in Las Vegas after suffering a bruised hip.

SUNS: The team announced the signings of four players, including guard Brandon Knight.

Knight, a restricted free agent, signed a five-year, $70 million deal, the same as was given fellow guard Eric Bledsoe last year.

The Suns also said they had signed free agent forward Mirza Teletovic, guard-forward Sonny Weems and point guard Ronnie Price. There were multiple reports of all four signings earlier this month.