The Saints are for an offensive player in Cash’s mold, who can also play in the back or even as a right end if necessary.
The money will be allowed to come out for about 12 million pounds.
West Ham has examined the 22-year-old in the past, but the Saints are lately very interested.
Cash broke into Forest as a teenager in 2016 after taking shape on a League Two loan with Dagenham-Redbridge.
Excellent performances followed in the championship, Forest finishing the season under a cloud after inexplicably losing a place in the play-offs.
However, Cash continued on Sabri Lamouchi’s team.
Ralph Hasenhuttl’s team has been heavily connected with a resolution to make Kyle Walker-Peters’ loan to Tottenham permanent.
And the Saints also sued 21-year-old American midfielder Weston McKennie, Germany’s Schalke holding a 25 million-pound deal.
McKennie joined Schalke’s academy as a teenager from FC Dallas in 2016 and was temporarily promoted to the ranks of the German club.
Now, a foreigner with 19 international matches, McKennie has been inspired by the Bundesliga, making 28 appearances this quarter.
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