Already without Zach Randolph, who was suspended for throwing a punch at the Thunder's Steven Adams in Game 6, Allen left the morning shootaround early with a trainer while wearing wraparound black glasses, according to ESPN.com's Brian Windhorst, who reports Allen may have been suffering from a migraine.
The 32-year-old Allen is the Grizzlies' top defender, and he has done a nice job guarding Kevin Durant, who is shooting only 41 percent in the series.
Memphis coach Dave Joerger wouldn't comment on Allen's status or what he is dealing with, and would only say "possibly" when asked if Allen would play on Saturday.
Allen hasn't started a game in the series, but is averaging 11.8 points, 8.3 rebounds, 2.0 steals and is shooting 50.8 percent from the field.
"It feels around the same, the pain is still there," Conley said. "I'm going to go as hard as I can for as long as I can."SI WIRE: V. Stiviano says she does not believe Donald Sterling is a racist
Added center Marc Gasol: "Fair or unfair, that's the situation that we're in."