straight to your inbox every day for freeManchester United have announced that co-chairman Avram Glazer has put a portion of his shares in the club up for sale.The United chief could receive roughly £71million after he put five million of his shares in United up for sale late on Thursday night.A deadline of Tuesday has been put on the sale of the shares, which were valued at $20.13 each (£14.39) when the New York Stock Market closed yesterday.Glazer, 60, has no guarantees of selling the shares -