Florian Lejeune was taken off on a stretcher in the second half of the clash at St James’ Park following a challenge with Palace winger Andros Townsend.
All-rounder Theunissen-Fourie (25) represented South Africa in four internationals – three ODIs and one Twenty20 – and was part of the 2013 World Cup squad.
The 29-year-old Northern Ireland star, a four-time major champion, has finished between fourth and 10th in each of the past five years at the Masters, sharing fifth last year, and is a Las Vegas oddsmakers pick to win this time.
City are second in the Premier League, two points behind Liverpool but having played a game less, and reached the final of the FA Cup after beating Brighton and Hove Albion 1-0 on Saturday.