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Brewster was carried off on a stretcher and required oxygen during Liverpool Under-23s' match with Manchester City on Friday after landing awkwardly.
Keegan said he sees similarities between his attack-minded Newcastle United team from 1995-96 and Jurgen Klopp's current squad.
After pulling out of the race to sign Arsenal's Alexis Sanchez, City are turning their focus to the West Brom defender, according to sources.
Arsenal have held talks with Borussia Dortmund over signing striker Pierre-Emerick Aubameyang, but are waiting for Alexis Sanchez to leave first.
The left-back has started the last five games following Antonio Valencia's injury and Ashley Young's suspension.
Jose Mourinho insists he is relaxed over whether Manchester United sign Alexis Sanchez or not as he knows the forward has a number of options and could stay at Arsenal.