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Liverpool are sweating over the fitness of Philippe Coutinho.

The Brazilian has been away on international duty and only arrived back in the UK on Wednesday night, along with countryman Roberto Firmino.

He was pictured at Liverpool's Spire Hospital on Thursday and is believed to have undergone a scan, reports the Liverpool Echo.

The in-form 24-year-old played 170 minutes of football for Brazil during the international break as he helped them clinch World Cup qualifying wins over Argentina and Peru.

Coutinho and Firmino reported to Melwood on Thursday but neither took part in training with Jurgen Klopp's squad.

(Image: AFP/Getty Images) (Image: REUTERS)

That wasn't a surprise in itself given the long journey home as it was likely to be treated as a recovery day for them.

But the fact that Coutinho went for a scan is a concern for Klopp given that Adam Lallana is expected to sit out Saturday's game due to a minor groin problem.

If Lallana and Coutinho both miss out then there are likely to be starts for Gini Wijnaldum and Daniel Sturridge at St Mary's.