Upton remained in the game Sunday and scored when Miguel Montero followed the beaning with a double. Shortly thereafter, Upton began experiencing nausea and he did not go out to right field for the start of the second inning.
D-backs team physician Michael Lee said after the game that Upton passed the neurological tests that were administered and that Upton had also gone through a CT scan, which did not show any problems.
Upton took an ImPACT neurological test Monday afternoon to determine if there are any lingering effects. Each player undergoes the test during Spring Training to form a baseline result that can be compared to in cases like this.
In an original lineup emailed out by the team, Upton was in the lineup, but after batting practice concluded, the team emailed out another lineup, this one without Upton in it. A team official declined to comment on the results of the ImPACT test, saying that Upton was given an extra day off as a precaution.
"I feel fine," Upton told reporters before batting practice. "I'm going out and doing my regular pregame routine so we'll see how it goes. I always say I can play. I don't see why not. We'll see what [manager Kirk Gibson] thinks. Obviously it's more important for me to be playing on Saturday than it is now, so we'll see what he thinks and go from there."
Saturday would be Game 1 of the National League Division Series.
Upton said it is the first time in his career that he has been hit in the head by a pitch, though he was hit in the head by a pickoff throw a few years ago.
"Any time a ball comes at your head, it's not exactly the funnest thing," he said. "We've gone through everything we have to go through. It's one of those things that happens in the game that you don't necessarily want to happen."