Jurgen Klopp’s concerns keep growing and the injury list keeps getting bigger and bigger. As the German is already sweating on the fitness of Sadio Mane and Jordan Henderson, Scottish left back leaves Liverpool manager puzzled.Robertson hobbled off during Scotland’s 2-0 win over Denmark at Hampden Park. The three points pushed his team into their crucial World Cup play-off in four months which is great news – however, Robertson’s injury is the last thing Klopp wanted to hear.Steven Gerrard against Liverpool? That day will come soon – and the Reds’ great wants to winThe 27-year-old Scotland captain fell to the turf on the 79th minute and was unable to complete the full 90 minutes.Jurgen Klopp will hope that Robertson’s name will not be added to a growing list of injuries at Anfield and what gives him room to hope is the fact that there are still no official medical updates provided by Liverpool or Scotland.With Roberto Firmino, Naby Keita and James Milner all suffering hamstring injuries, this particular setback seems to be plaguing the Reds.Sat, 20.30: (1.50) LIVERPOOL (4.60) ARSENAL (7.00) Another set of concerns this season are Mane (rib issue picked up while away with Senegal), team captain Henderson (unspecified injury) and Joe Gomez (foot injury).Saturday afternoon will show us Liverpool returning to Premier League action as the title chasers host the in-form Arsenal.Mikel Arteta’s side haven’t felt bitter taste of defeat for 10 consecutive matches (in all competitions) and Robertson’s absence could impose as a massive opportunity for the Gunners on their attacking right side at Anfield.Robertson’s understudy Kostas Tsimikas has proved an able deputy when called upon this term.