Sako left Wolverhampton Wanderers for Crystal Palace three years ago.
The Eagles talisman was confirmed to be out for over a month by manager Roy Hodgson.
The Crystal Palace winger suffered an injury in the draw with West Ham United.
The Crystal Palace player has been in impressive form recently.
Bakary Sako has just six months left on his Crystal Palace contract, meaning a return to Molineux with Wolves should be under consideration.
Crystal Palace beat Southampton 2-1 at St. Mary's last night.
The versatile Mali international has been very impressive for Crystal Palace recently.
Christian Benteke is suspended for Crystal Palace’s trip to Swansea City on Saturday.
Townsend was off the pitch when Crystal Palace scored both of their goals on Tuesday.
Wolves were interested in re-signing Bakary Sako in the summer - but he's still stuck at toiling Crystal Palace.