The central midfielder appeared to take a bang on the thigh during a challenge with Fernandinho during City's training session at the Estadio Do Dragao.
The club's top scorer has been a crucial cog in Guardiola's midfield since the turn of the year. Gundogan is also the only squad member to have starred in this final before, when Borussia Dortmund lost against Bayern Munich at Wembley in 2013.
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