Sevilla head coach Julen Lopetegui said Joris Gnagnon was "very, very worried" after his horror challenge left Liverpool teenager Yasser Larouci on a stretcher.
Sunday's friendly in Boston – won 2-1 by Sevilla – was marred by Gnagnon wildly kicking out at 18-year-old Liverpool left-back Larouci.
Sevilla defender and second-half substitute Gnagnon, who issued an apology post-game, was shown a straight red card with 14 minutes remaining, while Larouci required lengthy treatment at Fenway Park.
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"[Gnagnon] was very, very worried and knows it could have been a bad injury," Lopetegui said.