After White Sox rookie second baseman Yoan Moncada was carted off the field in the sixth inning Monday night, the crowd at Guaranteed Rate Field let out a collective groan as they viewed a replay of his ugly collision with right fielder Willy Garcia.

But the outlook for the team and both players was more optimistic after a 7-6 walk-off victory over the Blue Jays.

The scary play began when Darwin Barney hit the ball to short right field with the bases loaded against Sox starter James Sheileds. Moncada raced out for the ball as Garcia charged in. As Garcia slid to try to make the catch, Moncada’s knee hit the right side of Garcia’s head, and both players tumbled to the ground.

The ball fell out of Garcia’s glove, giving Barney a three-run double before play was stopped and the Sox rushed to check on their teammates. Garcia and Moncada stayed on the ground for several minutes. Moncada didn’t put any weight on his right leg as teammate Jose Abreu helped him climb on the cart. Garcia walked off the field himself.

The White Sox trailed 6-0 after the collision but came back to win on Matt Davidson’s second walk-off hit in two days, a single that scored Leury Garcia from third base.

Moncada was diagnosed with a bruised right knee after X-rays were negative, and the Sox designated him day to day. Willy Garcia was diagnosed with a bruised head and will be re-evaluated Tuesday.

“At first, I was knocked out,” Garcia said through a team interpreter. “I didn’t remember anything before I saw the video. And then I saw the video, and I said, ‘Wow, it was hard.’”

Moncada wasn’t available for comment, but Abreu said in English that the rookie was “very good” as media approached Abreu’s locker.

“I thought at the first moment that it was bad, really ugly,” Abreu said through an interpreter. “If you saw the play at the first moment, you’re not going to think that they would be good after that. Thank God they are, and that’s something that we have to be happy about.”

Ranked the top prospect in baseball this year, Moncada is one of the centerpieces of the rebuilding project that is well underway on the South Side. He was called up from Triple-A Charlotte for his Sox debut July 19, and Monday was his 12th game with the team. He is 4-for-38 with a double, a triple, a homer, six RBIs, six walks and 16 strikeouts.

Shields gave up solo home runs in the first four innings to lead. Josh Donaldson, Russell Martin and Justin Smoak.

But the Sox came back from a six-run deficit to win it.

Abreu’s RBI double and back-to-back homers from Davidson and Yolmer Sanchez cut the Blue Jays’ lead to 6-5 in the eighth.

In the ninth, Adam Engel beat out the throw to first for a one-out infield single, and Blue Jays closer Roberto Osuna hit Leury Garcia with a pitch.

Abreu then hit a two-out RBI single to tie it 6-6, and Davidson hit a walk-off single to center field. Davidson also hit a walk-off homer Sunday and is the first Sox player with back-to-back walk-off hits since Dave Martinez in 1997.

“We’re always fighting, no matter what,” Shields said. “We’re going to grind this thing out until the end of the season. I’m proud of these guys.”

The Sox didn’t record a hit over the first four innings against Blue Jays right-hander Marco Estrada. Tim Anderson and Willy Garcia broke through with back-to-back singles in the fifth. The Sox scored their only run against Estrada on Alen Hanson’s seventh-inning sacrifice fly.

Abreu’s RBI double and back-to-back homers from Matt Davidson and Yolmer Sanchez cut the Blue Jays’ lead to 6-5 in the eighth. An Abreu single tied the score 6-6 in the ninth before Davidson’s winner.

The Sox were trying to build on their victory Sunday, when Davidson hit a walk-off homer for just their second win in 16 games.

“We came off a really nice win last night,” Sox manager Rick Renteria said before the game. “I can surmise right now the guys are feeling pretty good because victories have that way of calming the waters a little.”