St George Illawarra workhorse Jack de Belin says he's happy to shift to the halves if Dragons coach Paul McGregor looks out of the box to fill the void left by injured skipper Gareth Widdop.

Widdop underwent scans on his left knee on Wednesday and is facing up to six weeks on the sidelines after suffering a medial ligament injury in the Dragons golden-point loss to the Roosters on Anzac Day.

Kurt Mann was moved into the halves to replace Widdop moments before half-time, but shifted to the wing for a large chunk of the second half after fullback Josh Dugan left the field for a HIA.

It left de Belin feeding the scrums, though he still managed to make 35 tackles and run for 119 metres. It was an unexpected detour, but De Belin said it wasn't too much of a stretch as the Dragons came within a point of what would've been a gutsy win over their traditional rivals.