Iannetta turned into a 93 miles per hour pitch from reliever Johnny Barbato in the seventh inning and appeared to be struck in the nose and mouth.
Iannetta was on the ground for several minutes with blood dripping from his face.
The $206.5million man for Arizona entered the seventh inning with 11 strikeouts and one walk on 90 pitches but allowed a solo homer to Gregory Polanco, who almost went deep on the second pitch of the at-bat before crushing a slider an estimated 382 feet to right field on Greinke's 95th pitch of the night.
He was taken to a hospital to be checked for head trauma, but was back with the team on Saturday.
"He was up walking around".
"His slider's been very good with late action in the hitting zone", Lovullo said.
Lovullo when asked following the game if the pitch that had hit Iannetta was intentional said that he stands by his thought that the pitch just got away from the Pittsburgh pitcher and was not intentional.
Will the Arizona Diamondbacks remain strong at home when they host the struggling Pittsburgh Pirates tonight at 9:40PM ET?
There is a history of such incidents between the two teams, but Lovullo said that he does not believe the Pirates were trying to hit Iannetta.
With a 3-for-5 night, Drury's single, double and home run fell just short of the cycle. Peralta hit his second double of the game with one out in the third, then came home on Jake Lamb's double for a 2-0 lead. He allowed three runs, struck out six and walked two in 6 1/3 innings.
Chicago starter Derek Holland (3-3) permitted seven runs, but just three earned, and six hits in five innings in taking the loss.
Goldschmidt had two homers, the second one measured at 453 feet, and drove in three runs for Arizona. "I know a lot of things don't work - manage like your hair's on fire, overplay everything, overreact to things", he said. Appearing in two games for the big-league club thus far in the 2017 regular season, Bracho owns a whopping 20.25 ERA alongside two strikeouts and one walk across 1.1 innings pitched. "Hopefully everything's all right and he gets back soon". The Giants, who have an MLB-worst 12-24 record, lost for the sixth time in seven games and for the 10th time in their last 12.
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