After throwing for 292 yards and three touchdowns in a 27-16 victory over Kansas City on Sunday, Manning went to the sideline in the fourth quarter with what he described as a bruised heel.
"I don't know exactly what it is," he said. "We'll find out more tomorrow. I can walk around and move around, but there is some discomfort."
Manning said he would assume he'll be ready for next week's game against Oakland. He first experienced the discomfort on his next-to-last play.
Before then, he and the Giants (4-0) were having a splendid day against the Chiefs (0-4). He threw two scoring passes to Steve Smith, who totaled 134 yards on 11 catches. Then he capped his day with a pass into the flat to Hakeen Nicks who turned it into a 54-yard catch-and-run for a 27-3 lead.
In the final minutes, Matt Cassel threw two short scoring passes that made the final score unreflective of how badly the Giants -- in their third straight road game -- outplayed the Chiefs.
Kansas City has lost 27 of its last 29, the sorriest chapter in team history.
Don't be fooled by the final score. From the first quarter, when Jamaal Charles fumbled the opening kickoff and Manning converted it into a quick TD, this battle between occupants of opposite ends of the NFL hierarchy never seemed in doubt. After going 0 for 11 in third-down conversions the week before against Philadelphia, the Chiefs were 2 for 15.
Cassel threw two short touchdown passes in the final minutes for Kansas City, making the final score look much closer than the game actually was. The Chiefs have lost their first four games for the first time since 1980.
Smith, who has caught at least one scoring pass in three straight games for the Giants, totaled 134 yards on 11 catches, including scoring receptions of 3 and 25 yards.
A 15-yard unnecessary roughness penalty on safety Jarrad Page for a hit on Smith helped put the Giants in position for their second TD, Manning's 25-yard pass to Smith.
Lawrence Tynes, a former Chief, kicked field goals of 25 and 40 yards for New York, which is 4-0 for the second year in a row.
Bryan Kehl, who recovered Charles' fumble of the opening kickoff, was again in the right spot when the Chiefs tried an onside kick to open the second half. He pounced on the ball and a few minutes later, Tynes' 40-yarder put the Giants on top 20-3 with 10:22 left in the third quarter.
The Chiefs kept it close in the first quarter with the help of two Giants turnovers. Tamba Hali sacked Manning and knocked the ball loose and Kansas City recovered on the New York 36. Six plays later, Ryan Succop kicked a 33-yard field goal.
Brandon Jacobs had 92 yards on 21 carries for the Giants, who rolled up 429 yards while holding the Chiefs to 193.
Nicks finished the Giants' scoring with a beauty of a catch-and-run. He took Manning's pass in the left flat and went streaking down the field. Cornerback Maurice Leggett caught up with him about 5 yards from the end zone, but Nicks put a move on him that left Leggett grasping at air while Nicks went sailing in for the score.
But that turned out to be Manning's final play and the Chiefs made it seem close with the two late scores. The first was set up by Charles' 53-yard return of the kickoff following Nicks' TD.