Recent transfer updates coming out of Manchester United could spell bad news for Sunderland where Chris Rigg is concerned. Sunderland star Chris Rigg has been turning heads this season, following his impressive breakthrough in the XI under Regis Le Bris. Rigg, 17, has featured in all nine of Sunderland’s Championship games this season, having started the last eight now. He’s also netted two goals, scoring an impressive back-heel goal against Middlesbrough and then scoring in the 2-2 draw with Leeds United last time out. This season, Real Madrid have been linked with Rigg. And since Madrid’s in…