As Andrew Robertson picked up a late yellow card against Bayern Munich on Wednesday, the hearts of Liverpool fans sank.
The ever reliable Scotsman will be suspended for the first leg of the Champions League quarter-final with Porto, meaning that the ever unreliable Alberto Moreno will likely step into the starting XI.
The Spaniard is almost certain to leave during the summer, meaning a vacancy will open up for a depth left-back.
Here are five possible candidates:
