Karl Darlow was injured in training on Wednesday and is out for the rest of the season.
He is a free agent after his contract with the Reds ended.
He spent the last two years on loan at Besiktas and Union Berlin.
A short-term deal has been agreed for the 29-year-old to join St James' Park.
In a morning session on Wednesday, Darlow tore ankle ligaments and had to be removed.
The 31-year-old now faces some time on the sidelines.
Under the terms of Martin Dubravka's loan move to Manchester United, Eddie Howe has had to look for a replacement for Nick Pope.
Alisson was signed as the club's No 1 goalkeeper two years later than the one who joined from Mainz in 2016 but that didn't stop him from being demoted to the bench.
His career at the club was ruined by his poor showing in the final of the club's competition, as he moved to Turkey and Germany.
The West ham game is on Sky Sports.
Bournemouth is on Saturday September 17th.
On Saturday October 1st, there will be an event.
Saturday October 8th.
Sunday October 16th: Manchester United.
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