Barcelona teenage midfielder Ilaix Moriba has hit back at coach Ronald Koeman.Ilaix has failed to agree terms with Barcelona over a new contract, with it reported that the 18-year-old's wage demands are greater than what the Catalan club are prepared to offer, and that led to Koeman criticising the young midfielder during Friday's pre-match press conference.Such comments provoked a response from Ilaix on social media, however."Thousands of rumours and nobody knows the truth," Ilaix posted on Instagram, using a quote from another page. It is thought that this is directed towards Koeman's remarks.Ilaix's contract expires next summer and RB Leipzig have already made a move to try and sign the prodigious midfielder, who Barcelona are prepared to sell for 15 million euros.