Super League Show: Round four preview

St Helens forward Jon Wilkin and Wigan assistant coach Iestyn Harris preview the fourth round of matches for BBC One's Super League Show.

Action starts on Thursday with Widnes Vikings looking to extend their unbeaten start to the season when they host Salford.

Wilkin talks about the influence Australian scrum-half Luke Walsh is having St Helens, while Harris praises Castleford's Ireland international Liam Finn ahead of Wigan's meeting with the Tigers on Sunday.

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