Liverpool midfielder Lucas Leiva will be sidelined until mid-August after suffering a hamstring injury on Wednesday evening.
The Brazilian was forced off the field during the Reds’ 2-0 win away to Huddersfield Town, replaced by academy goalkeeper Shamal George.
Having featured heavily throughout pre-season so far, Lucas underwent a scan that revealed frustrating results.
Lucas will also be unavailable against Chelsea, AC Milan, AS Roma, Barcelona and Mainz during pre-season.
Heavily linked with a move away from Merseyside this summer, with Turkish giants Galatasaray said to be weighing up a permanent move for his services, injury could put paid to Lucas’ plans.
The 29-year-old has endured a series of injury problems during his time with Liverpool, with an ACL rupture suffered in 2011 affecting his mobility on the field.
Though a tough-tackling midfield presence, this has seen Lucas jar with Klopp’s tactical ideals, with Germany international Emre Can preferred as the manager’s first-choice holding player.
Grujic has scored a goal in each of his pre-season appearances so far this summer, having joined Klopp’s squad after six months on loan with Red Star Belgrade.