Patterson was hit on the back of the helmet by a Josh Bard fastball during Friday night's game against the Red Sox.
The 31-year-old will begin the season on the disabled list, but it's currently unclear whether that will be the new seven-day DL or the 15-day DL.
The seven-day DL, which was announced Tuesday, is designed for players who are suffering from concussions. Blue Jays manager John Farrell was aware that new procedure was being discussed, but since it was released Tuesday afternoon he was unsure of whether it would be applicable to Patterson.
"I don't have the particulars or defined policy with that, so whether or not that would come into play with Patterson or not remains to be seen," Farrell said.
Patterson underwent a CT scan Friday night and passed a series of concussion-impact tests in the following days. Farrell originally thought that Patterson would be available to play in Tuesday's game against the Orioles, but his doctor recommended more rest to ensure that there were no lingering effects.
"The doctor that has examined him has recommended seven days from the incident," Farrell said prior to the game.
That means if there are no complications for the remainder of the week, Patterson could appear in a Minor League game on Friday. His stint on the disabled list can be backdated to March 25.
Patterson signed a Minor League contract with an invite to Spring Training, but was recently added to the Blue Jays 40-man roster and was expected to make the club as a fourth outfielder. He is a career .253 hitter with 112 home runs and 205 stolen bases over 11 seasons.
Utilityman Mike McCoy will back up center fielder Rajai Davis in Patterson's absence.