Prutton made 150 appearances in his first spell with Forest

The 25-year-old, who started his career at the City Ground, will stay with the League One outfit until his Saints contract runs out in the summer.

"I am sad to be going but it is a good chance for me and it will be nice to play regularly again," said Prutton.

"Forest are in with a great chance of promotion which was key in my decision. It's an attractive place to play."

He added: "I will have a look and see what is happening at the end of the season but at this stage I don't think I am likely to be back at Southampton.

"I really do hope Saints get promoted. They have a great bunch of lads and good management. It is a great set-up, there are some very good people at the club and they deserve to be in the top flight.

"I will miss everyone and wish them all well. I had a fantastic time here which saw me cover just about every possible aspect of football. I will take away a lot of good memories."

Saints signed Prutton from Forest for �2.5m in January 2003, but he has failed to force his way into George Burley's first-team plans after injury this season.