The extent of the injury wasn't known until later that night, according to Rockies manager Jim Tracy.
Gonzalez suffered a slight shin bruise in his right side on the same play, and Tracy said he will miss Monday's game against the Diamondbacks as a precaution.
Shortstop Troy Tulowitzki was also involved in the collision but escaped injury when all three chased after a pop fly in short left field.
"It was a potential disaster and, fortunately, we avoided it," Tracy said following the Rockies' intrasquad game Sunday, in which 10 pitchers, including starters Jorge De la Rosa and Felipe Paulino, received work. "I saw it, and honestly, all kidding aside, I took a deep breath. You had the third baseman, the shortstop and the left fielder, three pretty significant pieces to our puzzle, all going in the same general direction and all heading for the same point."
The severity of Stewart's injury wasn't known until everybody had left the ballpark.
"It tightened up on him and he started to feel a little bit uneasy with it," Tracy said. "I'm glad that it is just a week and we're not looking at two months or a season."
The three players involved in the play represent the heart of the order for the Rockies. Last year, they combined for 79 home runs and 273 RBIs.
Gonzalez reported some soreness Sunday, leading Tracy to give him an extra day of rest.
"We're guarded and cautious about it and rather than put him back out there and let him play some, we'll wait another day and see how he's doing," Tracy said. "If he's feeling all right, we can get him back out there and check it out."
Tracy does not want to see another repeat of last year, when Rockies players lost a total of 833 days to the disabled list.
"Fifty-eight one-run games, 30 losses in one-run games, 10 times on the road where you get walked off and you're 19 games under .500 on the road," Tracy continued, "and you add all that up and the Rockies still had a winning season. We didn't let any of it bother us. Did we think about it? Hell yes, it's human nature. But did it bother us to the point we were going to go back to that word 'excuse' and say 'this is the reason we didn't get that done.' I don't sit here and makes excuses."
De La Rosa gave up two runs on four hits in two innings. Paulino walked one and struck out two in his two innings. ... OF Tim Wheeler had the best offensive game, with three hits in four at-bats, including a double and home run. "The power is going to be there sometimes," Wheeler said. "Hopefully I can sneak some bags in there and do every part of the game proficiently." ... RHP Sean White threw an inning in his debut but was limited somewhat by a tight quad muscle.