Thibaut Courtois (left) started the 2-1 defeat by Man City last month, while Marcelo was an unused substitute
Real Madrid pair Thibaut Courtois and Marcelo are injury doubts for the Champions League last-16 second leg against Manchester City on 17 March.
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Belgium goalkeeper Courtois has an abductor injury while Brazil left-back Marcelo has a hamstring problem.
Real have not given a timescale for their recovery but say both players will be "monitored".
The 13-time European champions will already be without captain Sergio Ramos after he was sent off in the first leg.
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Real lost 2-1 to City at the Bernabeu after late goals from Gabriel Jesus and Kevin de Bruyne.
Source: bbc.com