The 25-year-old is working his way back to full fitness after recovering from the second of two lengthy spells on the sidelines for the Reds since his 2015 switch from Burnley.
Ings has been limited to just six Premier League appearances during his time with Jurgen Klopp's side, having been forced to spend most of the last two years out with knee problems.
Appearing in the Premier League 2 clash at Prenton Park this afternoon, Ings had multiple chances to score but was subject to some rough challenges from his City opponents and was even knocked over the advertising hoarding at one point.
Having sent a shot over the bar with just over half an hour played, Ings indicated that he could not continue and was promptly substituted off.
Ings's last competitive appearance for the first team came last October in an EFL Cup game against Tottenham Hotspur.