It's only natural they'd take notice.
Arguably no player has been hotter during the past four games than Keenan Allen, which is why the Kansas City Chiefs are wary of the wideout heading into the pivotal Week 15 clash.
KA13 caught six of eight targets for 111 yards, including a career-long 51-yard catch to set up a third-quarter touchdown. In the process, he posted his fourth-straight 100-yard receiving game, which is tied with Antonio Brown for the longest streak this season and is the second-best streak in Chargers history.
Oh, and this came after he became the first player in NFL history to record 10-plus catches, 100-plus receiving yards and at least one TD in three straight games against the Buffalo Bills, Dallas Cowboys and Cleveland Browns.
Overall, Allen has caught 83 passes for 1,142 yards and five touchdowns, setting career-highs in a single season for receptions and yards. His 1,142 receiving yards rank fifth in the NFL while his 83 catches are sixth. He's also been money on the money down, leading the league in third down receptions (31) and yards (464).
However, while Allen got off to a strong first half of the season, it's the last four weeks that have really taken the league by storm. He's caught 34 passes for 547 yards and four touchdowns, which is why he is a hot topic in Kansas City leading up to the game.
Here's what Defensive Coordinator Bob Sutton had to say:
"Keenan has always been a tough guy to cover. He's highly competitive, tough minded, goes in to make the tough catches (and) a good route runner. Understands leverages. He's just a really good football player. Certainly, when you're on the run he's on right here with the 100-yard games and 10 catches and touchdowns, when you have six for 100 or seven or eight, you went downhill, (that) says you're on a pretty good run. But he's just a good football player and anytime you have a dynamic player like that, that is performing consistently, one, forces a lot of attention from everybody, and then two, certainly from their standpoint, opens up other players."