The Eagles added undrafted rookie free agent wide receiver Keevan Lucas, with Jordan Matthews gone to Buffalo, releasing linebacker Steven Daniels for the second time. … Daniels forced a Donnel Pumphrey fumble in Saturday's practice. Ball security was a problem for Pumphrey in the preseason opener as he muffed a punt but fell on the loose ball. "We have to continue to work, work through that. Today was a very humid day. The guys were sweating a bunch," Eagles coach Doug Pederson said. "You could probably attribute it to that. I don't want to make excuses for guys. … Just got to make a point of emphasis with him." … Pederson said of tackle Halapoulivaati Vaitai (knee), "We're expecting maybe a couple days, get back out here and practice." Pederson said backup QB Nick Foles (elbow) was scheduled to do some throwing Saturday afternoon. "We'll see where he's at here in the next couple of days," Pederson said.