Some positive news on the Brittney Griner front from Colin Allred ... the U.S. congressman says officials have made "a very good offer" to Russia for the WNBA star -- and he's now as confident as ever that she'll be able to return home.
The representative couldn't get into specifics of the trade that America has sent to the Russians ... but he did tell TMZ Sports he believes the proposed swap is exactly what the foreign country is looking for in a deal for Griner.
"The ball is entirely in the Russians' court," Allred said Friday out on Capitol Hill .