Harvin's migraines are cause for concern

The latest news on wide receiver Percy Harvin is troubling for Vikings fans. He experienced another severe migraine episode at practice Thursday in which he vomited and collapsed. Harvin had to be taken from the field by ambulance to a nearby hospital. His migraine issues are not new, but now they seem to be occurring more frequently. If his playing time is significantly limited by the ailment this season that's a big blow to the Vikings offense. As for fantasy, it probably drops his value from a No. 2 or 3 receiver to a No. 4 or 5.

One guy who has been barely a blip on the fantasy radar this preseason is San Diego wide receiver Legedu Naanee. He's been having a strong month of August and has a good chance to start in the wake of veteran Vince Jackson's suspension. If you need receiver help in the last round or two of your draft, he could be worth a flier.

And speaking of the Chargers, fellow wide receiver Malcom Floyd has also been having a good camp and has already been penciled in as a starter on Week 1. With Phillip Rivers as his quarterback, Floyd has a lot of upside and should be considered a strong No. 3 receiver in fantasy.

Another receiver slowly climbing up the fantasy ladder is Houston Texans wideout Jacoby Jones. He's in a tight battle for the No. 2 spot with Kevin Walter. Jones was recently taken off punt return duties so he could concentrate on his receiver position. Jones probably has more fantasy potential than Walter but, even if Jones wins the job, he's no better than a No. 5 or 6 fantasy receiver at best.

Although Philadelphia running back LeSean McCoy has missed some practice time with injuries this month, he has still been impressive. He has apparently improved his pass-catching skills and has looked strong running inside. The Eagles will probably still be a pass-first, run-second team but, at this point, McCoy is a strong No. 2 fantasy back.

Another running back to keep tabs on the rest of the preseason is Kareem Huggins of Tampa Bay. After carrying eight times for 55 yards against Miami over the weekend, Huggins has been promoted to the first-string offense this week against Kansas City. Huggins is still a long shot to have fantasy value this year, but keep watching his progress.

Check out next Tuesday's print edition (Aug. 24) when I unveil my five fantasy busts/overvalued players for 2010 in the Fantasy Forum.