The midfielder moved to Forest on-loan from Borussia Dortmund in January.
So far, Reyna has only been on the pitch for 38 minutes and Berhalter admits it's a worrisome situation with their Nations League semifinal looming.
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We know Gio is a creative player. We know he's a great player for the final pass," Berhalter told The Athletic.
And you know, we have to see what he can do in terms of workload, how long he could last in the field because he hasn't been playing, but we also see other options as well."