As NFL training camp is finally fully underway, players begin the most grueling practices of the year leading up to preseason. Unfortunately, this means that injuries really start to take place for many players, with some missing the entire season before it truly begins.

Mike Williams

The Los Angeles Chargers have placed first round pick wide receiver Mike Williams on the active/physically unable to perform list. This means that Williams is not likely to practice at all during training camp and it may affect his chances of playing at the start of the regular season. Since Williams suffered the injury he has not been able to practice, with earlier reports from a few weeks ago putting his whole rookie season in doubt.

Keith Marshall

During Washington Redskins practice yesterday head coach Jay Gruden singled out running back Keith Marshall as a player to watch. Later in the day, Marshall hurt his knee during practice and had to be carted off the field. Unfortunately, he has torn his right patella tendon and will now miss the entire upcoming season. This will be the second straight season he has missed, as Marshall did not play during his rookie season due to an elbow injury.

Malik McDowell

Seattle Seahawks defensive tackle Malik McDowell was involved in a motor vehicle accident in Michigan according to the team. McDowell was selected by the Seahawks in the second round out this year's draft out of Michigan State.

As a precautionary measure, he has stayed in Michigan under medical care and is not at training camp. All head coach Pete Carroll had to say on the injury was “We'll see”, when asked if McDowell's rookie season was in jeopardy.

Markus Wheaton

Chicago Bears wide receiver Markus Wheaton underwent an appendectomy this morning and is still in the hospital, according to the head coach John Fox.

Apparently, Wheaton has stomach pains this at 4 a.m. and had the surgery at 9 in the morning. The Bears signed Wheaton to a two-year, $11 million deal this offseason. Last season, he only played in three games for the Pittsburgh Steelers because of a shoulder injury.

Crockett Gillmore

In Friday's practice, Baltimore Ravens tight end Crockett Gillmore suffered a knee injury, causing the team to add a tight end today. According to NFL Network's Ian Rapoport, Gillmore will be having surgery tomorrow to fix a torn meniscus. After that, the team will know the amount of time that he will miss. Last season, he was limited to seven games because of a back injury.