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Kiko Alonso is human.

The linebacker, whose rousing rookie performances inspired the Legend of Kiko movement among Buffalo Bills fans last year, is hurt.

Apparently it's bad.

The Bills announced they are gathering information about a potentially serious knee injury suffered while training on his own.

ESPN reported Alonso tore an anterior-cruciate ligament, and he's expected to miss the entire season. A Bills source confirmed to me that the injury looks like a year-ender.

"We have learned tonight that Kiko Alonso injured his knee while working out in Oregon," Bills GM Doug Whaley said in a statement. "We do not have the details at this point, but early indications are that it may be significant."

Alonso's agent, Steve Caric, declined to comment.

Alonso underwent hip surgery this offseason, but the Bills expected him to be fully ready for training camp later this month at St. John Fisher College.

Alonso was a Defensive Rookie of the Year runner-up last season and was named Defensive Rookie of the Month for September. He played middle linebacker, but the Bills thought he would be even more productive by moving him to weak-side linebacker this year.

Alonso finished third in the NFL with 159 tackles, including a league-high 72 assists.

He recorded 10 tackles for losses, two sacks, four interceptions, five pass breakups, a forced fumble and two recoveries.

Players voted Alonso 84th on the NFL Network's "The Top 100 Players of 2014" series.

Analytics site ProFootballFocus.com rated Alonso the NFL's 10th-best inside linebacker last season.