Gray
The clubs did not disclose any details but British media said Steven Gerrard's side paid a transfer fee of eight million pounds ($9.98 million), with Gray signing a four-year deal.
Gray has failed to cement his spot in the side and is likely to leave the Premier League club when his contract expires at the end of the season, Rodgers said.
Watford signed Gray only a few days before their first Premier League match against Liverpool on Saturday.
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