Sporting News' Vinnie Iyer continues his fantasy football preview series with an in-depth look at the four teams in the NFC North: Chicago, Detroit, Green Bay and Minnesota. Here's breaking down the core offensive skill position concerns for each team going into training camp.The Packers didn't improve much at wide receiver, while the Vikings traded away Stefon Diggs. The Bears have a quarterback battle and the Lions have a running back battle. Get the information you need to know before you start ranking the players in the division for your fantasy football draft. Learn more about your ad choices. Visit podcastchoices.com/adchoices