Jürgen Klopp will be permitted to name up to 12 substitutes for the meeting with Tottenham Hotspur at Estadio Metropolitano on June 1.
A group of 26 players, including Brewster, have spent this week in Marbella for a training camp as part of the Reds’ preparations for a second successive showpiece appearance.
The 19-year-old striker, who was on the bench for the semi-final second leg against FC Barcelona at Anfield, would cherish a chance to be involved in Madrid.
“Playing football and being back with the lads is really good. It’s really good to be back among it and training.