Black Stars winger Christian Atsu has been omitted from Newcastle United's 25-man Premier League squad for the 2020/21 season.
The 28-year-old together with Henri Saivet, Achraf Lazaar and Rolando Aarons failed to make the squad and Bruce has confirmed he will look to find new clubs for the quartet in the January transfer window as their contracts with the Magpies expire at the end of the season.
"Selecting the squad is always difficult because you know you have to leave people out," Bruce told Newcastle's official website.
"With all the players, they're professionals and they want to play week in, week out.
"With the players we've brought in, it makes it even tougher but it's a decision you have to make.
"Those who aren't involved will continue to train and keep themselves right and once we hit December and January, we hope we can get them fixed up with clubs."
Astu joined Newcastle United from Chelsea in 2017 on a four-your deal and has since very limited playing time due to an injury he sustained while playing for the Black Star during the Africa Cup of Nations in 2019.
He has previously played for FC Porto, Vitesse, Everton, Bournemouth and Spanish side, Malaga.