The NFL off-season has completely shift its focus to the NFL Draft, which is only weeks away. However, there’s still a few names out there in the free-agent market who could make significant impact next season.

Let’s take a look at the top remaining free agents:

Michael Crabtree: The underachieving receiver has a knack for overvaluing himself, which is a main reason why he’s still on the open market. Crabtree visited the Miami Dolphins last week and left empty handed. The Dolphins reportedly offered the 27-year-old $3 million per season, but of course, that wasn’t good enough.

So what exactly is Crabtree asking for?

Well, apparently he’s asking for something in the range of $4.5 million a year. But if he’s expecting that type of money from Oakland, he can probably forget about it.

Crabtree visited Oakland recently, but the Raiders wouldn’t budge. Although Crabtree hasn’t lived up to expectations, there’s still no denying his natural talent.

Wherever Crabtree ends up, that particular receiving core will get an immediate boost. The question is at what price?

Update: ESPN is reporting that Crabtree is set to sign with the Oakland Raiders. 

Stefan Wisniewski: While the casual fan may not understand, the center position is very vital to a team’s offensive success. After the quarterback, the center is typically the second voice in the huddle and at the line of scrimmage.

There’s multiple factors as to why Stefan Wisniewski hasn’t found a match yet. For one, his asking price is too high. He’s looking for a deal in the range of $5 million per year, which would make him the 10th highest paid center in the league.

Is Wisniewski worth it?

Keep in mind, Wisniewski is coming off shoulder surgery to repair a torn labrum. With that being said, if he’s able to stay healthy moving forward, Wisniewski is someone that possess versatility and good technique at the point of attack.

Joe Barksdale: The 26-year-old tackle started in all 16 games for the St. Louis Rams last year. Barksdale was a third round pick back in 2011, where the Oakland Raiders decided to take a chance on him.

Barksdale is listed at 6-foot-5, 326 pounds. He’s a guy that brings instant solidification to your front line to go along with experience. Barksdale just recently visited the Tennessee Titans, but they were unable to get a deal done. The Rams are still in the mix, but the two parties haven’t found a middle ground.

Greg Jennings: Even at the age of 31, Jennings has still proven to be durable. During his two seasons in Minnesota, he started in 31 of 32 games.

Last year, Jennings caught 59 passes for 742 yards with six touchdowns. While its apparent that Jennings has lost a step or two, he’s still a guy who could produce given the right situation.

Jennings has reportedly drawn interest from the likes of Oakland, Carolina, Miami and Jacksonville.