The English League One side had been linked with a move for the 21-year-old that could land Livingston up to £400,000. United, though, could face competition to land Scougall from league rivals Peterborough after they renewed their interest in the player six months after a £150,000 transfer collapsed at the last minute.
Scougall, who was also on Wolves' radar last summer, missed Livingston's weekend defeat by Morton with a hamstring injury.
"We've made an enquiry for Stefan, we're looking at a permanent deal. We'll see what happens," said Clough.