He suffered a broken leg last season whilst at Swansea City, and Swindon have been told it could be until November before he fully recovers.
Sturrock said: "We are all disappointed, but after taking the advice of the specialists and doctors, we felt this was the correct decision to take,"
"The finances come into it because we would have taken him on a year's contract, when he may not have been fit until November or later.
"I will continue the search for new players and strikers are very much at the forefront of my enquiries."