Liverpool boss Brendan Rodgers will speak to Raheem Sterling after the forward was pictured apparently taking nitrous oxide. Images published by The Sun  appear to show the 20-year-old England forward taking the legal substance, commonly known as laughing gas. Sterling scored in Liverpool’s 2-0 win over Newcastle at Anfield on Monday. “I don’t think it is something you should be doing, it’s as simple as that,” said Rodgers. The incident comes after Sterling admitted rejecting a new £100,000-a-week Liverpool contract in an interview with the BBC. “We want players here who are super-professional and focused on their football – I know he is,” added Rodgers. “It’s not just on the field, it’s off the field as well but I will speak with him on it and we’ll move on. “Young players make mistakes. As long as they learn from them, that is what is important.” Nitrous oxide is often used in surgery and dentistry for its anaesthetic effects but it is also a popular legal high as it can make people feel relaxed, euphoric and giggly.