the £ 6million summer signing suffered a collapsed lung in february and it was initially feared he would miss the remainder of the campaign , especially as it was the second time he had fallen victim to the problem .
the 26-year-old returned to training earlier this month and will now feature for united 's reserves when they entertain derby county at st james ' park on wednesday night .
newcastle boss john carver will be hoping his side will improve following the return of de jong .