"Finishing third last season and qualifying for Europe was huge. I want to pick up from where I left off."

Long's last goal for Motherwell came in the final match of the truncated 2019/20 season, his strike in a 1-1 draw with Hearts securing a third-place finish.

"It's great to have Christopher back," said manager Stephen Robinson.

"He made a big impression last season and, once we get him up to speed again, we want to get even more from him this campaign."