the england international , who was caught puffing on a shisha pipe , will face at club investigation over why he was taking the legal high , which is also known as ` hippy crack ' .
in the footage sterling is seen sucking on an orange balloon then laughing and giggling before he asks one of his friends to give him another hit .
it is claimed that the video shows him and breathing in gas from a balloon before apparently passing out .
sterling scored the opening goal in monday night 's 2-0 victory over newcastle united .
he also missed a chance from six yards in the 56th minute .