Leeds suffer more injury misery
The news could dent the champions' hopes of breaking into the top four and reaching the Carnegie Challenge Cup final.
Kiwi full-back Webb and Samoan prop Leuluai have both torn ankle ligaments, the latter in last week's loss against Crusaders, while scans have confirmed ex-Great Britain hooker Diskin tore a groin muscle during the win at Harlequins.
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Hide AdThey will each be sidelined for between four and six weeks, missing Leeds' trip to high-flying Warrington on Sunday, as well as other key Super League games against St Helens, Hull KR and Huddersfield as well as, potentially, the Challenge Cup semi-final against Saints on August 7.
However, coach Brian McClennan should be heartened by the imminent return of three other injured players - England scrum-half Rob Burrow, New Zealand second rower Ali Lauitiiti and prop Luke Burgess have all resumed light training after their own fitness issues.