Manchester City forward Raheem Sterling has been ruled out of England's upcoming matches against Spain and Switzerland due to a back problem.
The 23-year-old withdrew from the squad on Monday as the other 22 players assembled for a training camp at St George's Park.
"Raheem Sterling has withdrawn from the squad due to a problem with his back, with no immediate replacement planned," read a Football Association statement.
Southgate is already thin on options in the front third following Jamie Vardy's decision to step back from international duty .
England open their Nations League campaign against Spain at Wembley on Saturday, with a friendly against Switzerland at King Power Stadium to follow three days later.
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