choose as

choose (one) as (something)

To select someone for a particular role or job. Whom has he chosen as his successor?
See also: choose
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

choose someone as something

to select someone to be something. We will choose her as our representative. I chose Sam as my assistant.
See also: choose
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in classic literature ?
But it was Lady Lundie's turn to choose a second player on her side.