"The knee is very swollen and we will know more when it's settled down and he's had more scans and that won't be until some time next week.
"We will be speaking to a specialist and planning his recovery but we won't put any timescale on a return until we have more information on the damage to the knee.
"The injury is extensive enough though for us to rule him out for the rest of the season."
The Argentine midfielder was strechered off in the final stages of the game and spent the night in hospital.