Troubled singer Justin Bieber's manager Scooter Braun will be questioned about the former's steroid use in the court here.

Braun was subpoenaed last month, and the deposition will now take place here May 15, reports showbizspy.com.

It's all part of the case against Bieber, 20, for allegedly attacking Florida-based photographer Jeffrey Binion.

`Scooter will be asked about what kind of advice Justin has received about handling photographers and did he ever discuss wanting to lash out at them,` said a source.

`It has also been circulating that Justin has been abusing steroids, and so if that is the case it will result in his aggression and aggressive tendencies. That's something Scooter will definitely have to answer to," added the source.