"It's more than that," Coughlin said, according to ESPN.com. "We're trying to put a team together. We saw too much of that in the spring."
Beckham was held out of several practices during OTAs and minicamp because of the same hamstring injury. Coughlin called out Beckham last week after he stopped short on a deep route, leading to a Dominique Rodgers-Cromartie interception.
"He's got some work to do, just like they all do," Coughlin said after that practice, via the Sporting News.
"We're not going to let him go if he's in danger of hurting himself. That's all there is to it," Coughlin said. "I can stand here and fight all I want. It's not going to matter."
Coughlin has been around forever, so he knows the more reps Beckham misses this summer, the less he's able to make an instant impact as a rookie.