Fantasy Football Week 4: Michael Vick and 4 Stars with Red Flags

It's unfortunate that this happens, but it's inevitable and part of football.

Each year there are those stars that perform miraculously, as well as the players who step up and emerge as stars.

However, each season is no exemption from star players who are underachieving despite being healthy, or they are not healthy, thus not even having the chance to perform.

So with that in mind, here are five star players to be cautious about playing in Week 4.

Michael Vick

Despite being expected to play in Week 4 against San Francisco, Eagles quarterback Mike Vick has yet another injury, this time to his non-throwing hand.

Although it's not as serious as a concussion, it's certainly not good either. As much scrambling as Vick likes to do, the injury is going to force him to carry the football in one hand.

Therefore, it's only going to increase the risk of fumbling or making the injury worse when he puts both hands over the rock and takes a hit.

He's also been somewhat underperforming. The standards are high, and we expect more from Vick.

Michael Turner

After the first two games, Falcons running back Michael Turner had rushed for at least 100 yards in each game, and was averaging 7.7 yards per carry.

In Week 3 however, he was shut down by the Tampa Bay Buccaneers on the road, and only gained 20 yards on 11 carries.

Week 4 pits another solid test for Turner, as the Seattle Seahawks have an underrated defense and rank No. 13 in rush defense.

And although Seattle hasn't faced an offense quite like Atlanta's, the Seahawks are very capable of slowing down Atlanta, as they are better than Chicago. The Falcons also struggle on the road.

Brandon Marshall

Last week the Cleveland Browns held Miami receiver Brandon Marshall to just 43 receiving yards on four receptions, and he was completely blocked out inside the red zone.

It was his lowest performance of the young season, but even more shocking is that he has only scored one touchdown in three games.

Well, expect that to continue this week in Southern California, as the Dolphins visit the San Diego Chargers.

The Bolts have lived off a rather weak schedule, but they have a history of starting off slow.

Against Miami, however, San Diego will keep rolling and Marshall will be shut down again. Marshall and the rest of the Dolphins must be lacking confident and feeling frustrated after starting 0-3.

Chris Johnson

Through three games, Titans running back Chris Johnson has only compiled 98 yards on 46 carries and has yet to score a touchdown.

In addition, he only has 13 catches for 91 yards and once again, no touchdowns

Now, don't be fooled this week as he faces the Cleveland Browns and their No. 29-ranked pass defense.

The Browns are gaining confidence with each game, and Johnson couldn't even gain 25 yards against a very, very weak Denver Broncos rush defense at home.

It's obvious that he's been significantly underperforming, so don't be surprised when he disappoints again.

Be sure to check out John on Bleacher Report.

And you can follow him on Twitter @ Sportswriter27.