The knock picked up by Junior Firpo during the Whites’ pre-season friendly against Blackpool cast further light on an existing issue in the Leeds squad.
Whites boss Jesse Marsch, who says the club were already onto the task of strengthening at left back, was left to try a few options in Firpo’s position as the players left for Australia without him.
Young defender Leif Davis was given something like a trial down under, but upon his return the 22-year-old was sold to League One side Ipswich Town.
Speaking after United’s pre-season friendly against Cagliari, Marsch said the club are confident of meeting their aims of adding a left back and striker.
"We want to make some more additions, and we have some targets, and we wanted this last week to really evaluate things and then to be prudent on our future decisions," he said.
"Hopefully this week we'll make some final decisions and make some final moves."
Here are 13 left-backs who are currently free agents available to Leeds United:
1. Ismaily
After nine years at Shakhtar Donetsk, the Brazilian’s contract at the Ukrainian side elapsed at the end of July.
2. Marcelo
The Brazil international became a free agent this summer after making 386 appearances for Real Madrid.
3. Vital N’Simba
The £2.25m-rated has spent four seasons at Ligue 1 side Clermont but is now without a club.
4. Ambroise Oyongo
The former New York Red Bulls defender spent his final season at Montpellier between the Ligue 1 side’s reserves team and loan club Krasnodar.
5. Faouzi Ghoulam
The 31-year-old former Napoli defender boasts considerable Champions League and Europa League experience.
6. Nacho Monreal
The former Arsenal man made 69 appearances for Real Sociedad before his contract ran out in July.