Manchester United cannot start next season with David de Gea,Sergio Romero, and Dean Henderson in their squad and insists he would not swap De Gea 'for anyone'.De Gea, 29, signed a new four-year contract in September but his form has been problematic for upwards of a year and Henderson has thrived on loan at Sheffield United, two points below United in the Premier League table.Henderson, 23, inked a new three-year deal with United in July and the club are prepared to offer him improved terms.