Fantasy Football Preview 2013: Percy Harvin and Matt Flynn Trades and Mike Wallace Are Most Improved As Carson Palmer Will Score Big With Larry Fitzgerald For Arizona Cardinals

The NFL offseason saw a number of big name players change teams throughout the league, including a number that will have large impacts on the fantasy football season, such as Mike Wallace, Percy Harvin, Matt Flynn, Carson Palmer and Kevin Kolb.

The Miami Dolphins made the most noise of any team in their division so far this offseason with the signings of Mike Wallace, Jared Cook, Phillip Wheeler and Dannell Ellerbe and the addition of Wallace could prove to be the most valuable, as Ryan Tannehill now has a prime number one receiver to throw to after the Dolphins got rid of Brandon Marshall and after letting Reggie Bush go in free agency the team will need to get the ball down the field. The loss of Anthony Fasano will hurt Tannehill, but since the Dolphins brought in Cook, Wallace will not be the only option and along with Davone Bess and Brian Hartline, the team now has three dependable receivers.

The Kansas City Chiefs have the chance to be one of the most improved teams in the league after going just 2-14 last season after making the trade for Alex Smith and their offense should be the biggest beneficiary, including Jamaal Charles and Dwayne Bowe. Smith was relegated to backup status last season after getting hurt and although he doesn't put up Drew Brees type numbers, he does not turn the ball over and head coach Andy Reid will put him in situations to rack up yardage with Anthony Fasano, who should also improve his numbers from last year with the Dolphins.

The Oakland Raiders additions this offseason could payoff in fantasy, especially if Darren McFadden can somehow remain healthy for at least half of the season. Carson Palmer put up some large passing numbers last season while playing from behind most of the year and while Matt Flynn is untested, he could have some solid weapons in Denarius Moore and Jacoby Ford, who is one of the fastest players in the league. The loss of Brandon Myers at tight end will be tough, but if the team can snag Zach Ertz Tyler Eifert or one of the other tight ends in the draft, the team should benefit.

The Seattle Seahawks were already Super Bowl contenders when last season ended and during the offseason they added more talent that should make them dangerous, including wide receiver Percy Harvin, who was acquired in a trade from the Minnesota Vikings. Harvin is one of the most explosive players in the league and bringing him into an offense that already has Russell Wilson, Marshawn Lynch and Sidney Rice should only get better. Harvin's numbers suffered due to injuries and the fact that Christian Ponder was his quarterback and despite missing games he still led the team in receiving.

The Detroit Lions added Reggie Bush from the Dolphins in the offseason and he should be a perfect fit alongside quarterback Matthew Stafford and wideout Calvin Johnson, especially since he can catch balls out of the backfield. Bush is more explosive when catching the ball in space and he proved in Miami that he can be an every down back.