The England youngster was sent off by referee Mark Halsey just before half time, following a challenge on United defender Jonny Evans.
Ferguson told BBC Sport: “Jonjo Shelvey’s sending off was a clear red card, there was a dangerous attempt to go for the ball.
“Jonny Evans went for the ball and got it, and I don’t think there was any other decision referee could make.”
United won 2-1 against Liverpool.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.