The goalkeeper took a blow to the back on Monday and the Germany international will train alone for a short while as a precautionary measure.
The German goalkeeper, who will rival fellow summer arrival Claudio Bravo for the position of No.1 at Camp Nou in 2014-15, suffered a blow to his spine during training on Monday.
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Barca's medical team assessed on Tuesday that Ter Stegen's injury is not a major one but has decided to keep him out of first-team training for a short while as a precaution.
"New first team goalkeeper Marc-Andre ter Stegen suffered a blow to his spine during the second of Monday’s two training sessions," a club statement read. "Tests early on Tuesday confirmed the injury of the German goalkeeper who will work on his own for the next training sessions."
Bravo's signing means that at least Luis Enrique will not be short of a quality solution should Ter Stegen's injury be worse than at first feared, with former Barca B shot-stopper Jordi Masip also an option for the new coach ahead of the first Liga game of the season on Sunday, Aug. 24 versus Elche.
Ter Stegen has also avoided the fate of another summer signing, former Arsenal captain Thomas Vermaelen, who is out for an indefinite period of time with a hamstring injury sustained during the World Cup.