The England full-back made his first appearance of the season as a late substitute in the Premier League clash at the Britannia Stadium. Johnson missed the start of the season with a thigh problem and he could now be out again with the hamstring injury. Johnson revealed on Twitter: "Can't believe my luck at the mo. Done my hammy again today! Hopefully be back soon!" The news will be a blow for Reds boss Kenny Dalglish as fellow right-back Martin Kelly is also recovering from a hamstring injury of his own.