As ever, Newcastle United cannot fully enjoy a victory it seems. Indeed, even despite becoming the first team to beat Aston Villa in their own backyard in the Premier League this season, Newcastle lost a player to injury. While the extent of Alexander Isak’s groin problem remains unclear, the Swede was forced off before half-time at Villa Park. Eddie Howe could now be left light for the visit of Luton on Saturday. Callum Wilson would usually back up Isak but has been missing of late and it seems he will not be in line to feature. Callum Wilson injury: Eddie Howe shares Newcastle latestSpeaking…