Watford&rsquo;s Odion Ighalo is a huge doubt to play for Nigeria&rsquo;s U23 National Team at this summer&rsquo;s Olympic Games in <span>Rio de Janeiro. <br /><br />Speculation is rife in the local media that the Hornets number 24 will be one of the three experienced players in Samson Siasia</span>&rsquo;s squad list but it has come to light that he might not be released by the Premier League club. <br /><br />&ldquo;Odion Ighalo was not interested in playing at the Olympic Games at first, but had a rethink after Siasia traveled to London to visit him and Mikel last month, &rdquo; a source close to Ighalo told <b>allnigeriasoccer.com</b>.<br /><br />&ldquo;At this stage, Watford have not given him permission to play for Nigeria in Brazil. &rdquo; <br /><br />Odion Ighalo is in Lagos, the commercial capital of Nigeria, at the moment but must return to his home in London in the coming days before the start of pre-season training at Watford <br /><br />Ifeanyi Emmanuel <br />