Henderson had been struggling with a hamstring injury during the international break, which saw him sit out of the England squad that beat Croatia to win through to the Nations League finals.
According to 'Sky Sports News', the midfielder has resumed full training with his club teammates, and is expected to make Liverpool's squad for their clash with Watford on Saturday.
The midfielder habitually struggles with hamstring problems, with the injury resurfacing this season after it had caused him trouble during the World Cup in Russia.
Henderson had missed the last four games for Liverpool, before returning as a substitute against Fulham before the international break.
Liverpool travel to face Watford at Vicarage Road on Saturday, as one of the three remaining unbeaten sides in the division after 12 matches played so far.