The transfer portal for college football opens on Dec. 9. Here’s the full schedule, key dates and what Iowa State football’s needs are.

Iowa State's secondary will be one of the hardest-hit units by graduation. The Cyclones are losing a ton of experience, with three-year starter Myles Purchase and sixth-year senior Darien Porter set to graduate. The 6-foot-4, 200-pound Porter is also an impact player on special teams and his frame and athleticism aren't typical for his position.

The portal remains open until Dec. 28. There is also a portal window in the spring. Here's a look at OU football's portal departures and, eventually, the additions: More: What OU