Jurgen Klopp expressed his unhappiness over Marko Grujic's progress at Liverpool and hinted he will take a decision on his future after the end of the season.
The 20-year-old was signed by the Reds from Red Star Belgrade in January 2016. He rejoined his former club on loan for the remainder of the 2015/16 season, before returning to Merseyside last summer.
Grujic's debut season at Liverpool has been decimated by injuries and his last appearance for the first team came in the EFL Cup win over Leeds United in November. In addition to this, he has played for 28 minutes in the Premier League.
The Serbian international has recovered from his injury setbacks and has been on the bench in his side's last two matches. He featured for the Liverpool Under-23s in March to regain his fitness. Klopp was in the stands during the Reds' Under-23 fixture against Chelsea and Grujic's display against the west London club did not impress the former Borussia Dortmund manager.
"He played in the under-23s then he was injured. I watched the game against Chelsea (on March 13) and it was a really good game," Klopp explained, as quoted by the Liverpool Echo.
"After 60 minutes he was getting tired then we couldn't involve him in our training regularly. It's not too cool. We have to think about it."
Klopp is already without the services of Jordan Henderson and Adam Lallana in the midfield as the England internationals are on the sidelines, recovering from their foot and thigh injuries respectively. The Reds boss has stressed the midfielder's struggle will only make it difficult for him to select his starting XI for Stoke City (8 April) as Liverpool are battling with injuries.
"Maybe when I know the system we exactly want to play in (against Stoke), that depends too on what the doc tells me," he stressed.
"We have to see what players can best play in each position. He's an option for one of these positions depending on what system we play."
Liverpool are third in the Premier League table with 59 points after 31 games, leading fourth place Manchester City by a point and fifth place Arsenal by five points. However, both the clubs have an advantage as City and Arsenal have one and two games in hand respectively.