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Liverpool returned to training at Melwood ahead of their EFL Cup clash with Derby County this week – but there was no sign of Roberto Firmino or Daniel Sturridge.

Firmino missed the 2-1 win at Chelsea on Friday with a groin strain, while Sturridge was substituted after 56 minutes at Stamford Bridge.

Watch: Liverpool's win at Stamford Bridge in pictures

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Despite heading straight down the tunnel, Jurgen Klopp later insisted the change had been a tactical switch, rather than an injury problem for the striker.

“I could see that Daniel couldn't sprint any more, and we had a healthy young striker on the bench, so I thought we should use him,” said Klopp.

“The first half was really good from Daniel, but we needed this player there in the centre that we could play with, and play in behind and push up with.

“It's not an injury, it's just a situation. Nobody told me about an injury.”

Both forwards were not spotted during Sunday's training session however, although Sturridge is on a tailored training regime, so his absence may not necessarily be bad news for Liverpool.

Gini Wijnaldum was another player who wasn't pictured during the afternoon.

Ragnar Klavan and Emre Can – both absentees in West London – were snapped outside.

Klopp will have a number of dilemmas to solve ahead of Tuesday's game at Pride Park, with the Liverpool boss needing to decide whether to shuffle the pack against the Championship side.