Arne Slot bemoaned the “very unlucky and very unhappy” groin injury recently suffered by Alexander Isak, but was optimistic of a swift recovery for his costly recruit. When Liverpool confirmed the record-breaking arrival of Isak on Deadline Day after a summer-long saga, the Reds were expected by many to canter to successive Premier League titles. However, a disrupted preseason and a broken leg mean Isak has had anything but a dream debut campaign on Merseyside, having established himself as a superstar at St. James’ Park. The former Newcastle United striker only recently returned from his major leg injury, and was seemingly on the come-up once more after a few sluggish outings. Isak scored his first Premier League goal at Anfield since he donned Saudi green for the Magpies, but the Swede has since suffered a setback. Here are the details of Isak’s latest injury, and when he could next be in action for the Reds. What Injury Does Alexander Isak Have? Isak suffered his latest injury in training.…