The NFL preseason has officially started. Teams are now playing their exhibition games leading up to the 2022 NFL season. The start of the regular season is now less than a month away. This means it's time for all teams to start making some final decisions about their roster construction.There are star players who are currently available in the trade market. They can jump in and help out a team immediately. These finishing pieces could make a major impact this year if they are traded to a new team. Here are five potential trades that could happen before the conclusion of the NFL preseason.#1 - Roquan Smith to the Dallas CowboysChicago Bears ILB Roquan SmithRoquan Smith recently requested a trade from the Chicago Bears after failing to come to an agreement on a long-term contract extension. If the Bears do, in fact, trade him, he figures to have a huge market of interested teams because he is one of the best inside linebackers in the NFL.The Dallas Cowboys are one of the teams that makes the most sense as a potential destination. They are currently projected to have around $20 million in available cap space, so they have room to make a big move ahead of the 2022 NFL season. Smith would provide them with a massive upgrade in the middle of their defense, where the inside linebacker is one of their biggest weaknesses.#2 - Kareem Hunt to the Atlanta FalconsCleveland Browns RB Kareem HuntKareem Hunt is entering the final year of his contract with the Cleveland Browns ahead of the 2022 NFL season. After failing to come to terms on a new deal, Hunt has formally requested to be traded to a new team.Pat McAfee@PatMcAfeeShowKareem Hunt wants AHT of Cleveland.. MORE drama for the Browns#PMSLive28517Kareem Hunt wants AHT of Cleveland.. MORE drama for the Browns#PMSLive https://t.co/s8hLr2O5YuHunt would likely attract attention from several different teams if the Browns do decide to trade him. The Atlanta Falcons appear to be one of the most ideal landing spots. Hunt could potentially form a versatile duo with Cordarrelle Patterson, who had a breakout year in 2021 but would likely benefit from a committee approach moving forward.