Raheem Sterling will have to explain himself to Liverpool after apparently being filmed inhaling the legal high nitrous oxide.
Manager Brendan Rodgers said he regarded the 20-year-old as "super-professional" but would need to speak to the England international about his lifestyle.
Footage of Sterling appearing to take 'laughing gas' and pass out unconscious emerged online during the Reds' 2-0 Barclays Premier League win over 10-man Newcastle at Anfield on Monday.
Sterling impressed on the field, scoring a superb opening goal inside nine minutes, although he later missed two clear-cut chances, and afterwards off-field issues dominated.
For me it is something that when you are a professional sportsperson at the top level of the game, I don't think it is something you should be doing. It is as simple as that.
But I will speak to him on it, to see what he says. We want players here who are super-professional and focused on their football. I know he is, he very much is focused on his football and improving as a player.
As I have said before, young players make mistakes. As long as they learn from them, that is what is important.
Liverpool have said they are aware of footage of striker Raheem Sterling apparently taking nitrous oxide.
Pictures published on The Sun's website (£) appear to show the England international passing out unconscious after taking the substance, described as a legal high.
The report surfaced as Sterling was playing - and scoring - in Liverpool's Premier League game against Newcastle at Anfield.
A club spokesperson said: "We are aware of the story and intend to speak to the player. Any subsequent action will be taken internally."
Defender Emre Can misses the FA Cup quarter-final replay against Blackburn at Ewood Park as he serves a one-match ban.
Fellow centre-back Martin Skrtel and captain Steven Gerrard are also suspended so it seems likely Dejan Lovren will make his first start since the original tie against Rovers at Anfield over a month ago.
Striker Mario Balotelli, who missed Saturday's league defeat at Arsenal with a knee problem, will be assessed ahead of the short trip to East Lancashire.
Liverpool squad: Mignolet, Toure, Lovren, Sakho, Johnson, Henderson, Allen, Markovic, Sterling, Coutinho, Sturridge, Jones, Manquillo, Enrique, Brannagan, Lucas, Lambert, Borini, Balotelli.
Raheem Sterling has told the BBC he doesn't want to be seen "as a money grabbing 20 year-old" as rumours circulate about his contract discussions at Liverpool.
Reports in various UK newspapers this month have suggested that Sterling is refusing to sign a new £100,000 a week deal, although the only official comment from Liverpool revealed that talks have been postponed by Sterling's representatives until the summer.
Speaking to the BBC, he said:
I don't want to be perceived as a money grabbing 20 year-old. I just want to be seen as the kid that loves to play football.
Croatian international Mateo Kovacic will join Liverpool for £22m in May, according to reports in Italy today.
The Austrian born attacking midfielder has also been attracting interest from Arsenal, but reports in Italy suggest cash-strapped Inter are desperate to sell and the Reds have agreed to meet their asking price.
Kovacic, who turns 21 in May and has already racked up 19 caps for Croatia, joined the Serie A club in a deal worth around £11m back in January 2013.
Earlier today, we brought you reports that Brendan Rodgers is planning to rejuvenate his attacking options this summer by offloading a trio of first team stars.
Liverpool have put Mario Balotelli, Fabio Borini and Rickie Lambert on the transfer list in a bid to rejuvenate their attacking optionsRead the full story ›
Liverpool defender Martin Skrtel has denied intentionally stamping on ManUnited goalkeeper David de Gea after being landed with a Football Association charge.
Skrtel will argue the incident, which occurred towards the end of the Reds' 2-1 defeat at home to United on Sunday, was accidental.
Skrtel, who had been given until 6pm on Tuesday to respond to a violent conduct charge, landed on the United stopper's right shin while chasing a through ball in the dying seconds of the encounter.
De Gea was incensed at the coming-together and the pair exchanged words shortly before the final whistle.
But the incident was missed by referee Martin Atkinson, meaning the FA could take retrospective action against the centre-half.
A three-man panel of former elite officials were asked by the governing body to review the footage independently of each other and there was unanimous agreement the offence warranted a red card.
Juan Mata was the star of the show as Man United moved five points clear of Liverpool at Anfield on SundayRead the full story ›
Steven Gerrard has apologised to Liverpool supporters and his team-mates after being sent off for a stamp in Sunday's defeat against Man United.
Liverpool's captain was dismissed 40 seconds after replacing Adam Lallana at half-time for a stamp on Ander Herrera.
The Reds, who were already 1-0 behind at the time, went on the lose the match 2-1 and now trail United by five points in the race for Champions League qualification.
Speaking to Sky Sports after the match, Gerrard said:
I need to accept it, the decision was right. I've let down my team-mates and the supporters. I take full responsibility. I've been in the game long enough when you do something like that. I take full responsibility.
I don't know what caused it. I don't know. Probably just a reaction to the initial tackle. I shouldn't say more about it really, I've just come out here to apologise to the dressing room and supporters, because I take full responsibility for today's result.