The 32-year-old player from Dumfries was hurt on the head during an apparent fracas at the side of the pitch.
The incident happened during a North / South Lanarkshire League fixture between Lochmaben Amateurs and Chapelhall Thistle FC from Airdrie.
Police Scotland say the disturbance was believed to involve a number of people.
A spokesman at Dumfries said: “The victim received what was described as a punch.
“After the game he attended Dumfries and Galloway Royal Infirmary where, after examination, it was found that he had a fracture to a bone in his face.”
The match at Lochmaben’s Whitehill Park, which was watched by visiting and local spectators and officials, carried on and resulted in a 3-2 victory for the home side.
Club secretary William Howat explained the player, a striker, did not realise the seriousness of his injury at the time and continued to play.
He said: “The boys were upset by what happened. It just came out of the blue. The player was allowed home later from the hospital after an x-ray and treatment but will need to go back.
“We’ve four games left this season and I doubt if he will be fit to play in any of them.”
Police have appealed for anyone who witnessed the incident during the match or has any other information to contact them on telephone number 101.