"We know Virgil van Dijk will stay weeks out of the team and it's important to find a good balance without him for three weeks," Puel told reporters on Monday.
Van Dijk has missed Southampton's last two matches after sustaining an ankle injury in the Premier League victory over champions Leicester City last week.
"We will see how many times he will not be available but for the team but for the moment, it's important like against Liverpool to see a balance in defence," Puel added.
"Perhaps there is a possibility at the end of the transfer window to see about this position."
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Southampton, who are 11th in the Premier League, travel to face relegation-threatened Swansea City on Tuesday.
(Reporting by Shravanth Vijayakumar in Bengaluru, editing by Ed Osmond)
