Suarez and Patrice Evra are set to meet again on Saturday after the pair were involved in a well-documented fracas at Anfield in October. The Uruguayan received an eight-match ban for his part in the incident, which remains an inflammatory subject between the old foes.
Liverpool boss Kenny Dalglish claimed Suarez should never have been suspended in the first place as Suarez made his comeback from suspension against Tottenham on Monday night.
However, Ferguson says he cannot understand why Liverpool did not continue their attempts to clear Suarez's name if Dalglish believes the ban was unjust.
"Well, why didn't they appeal?" said Ferguson. "They've said plenty, haven't they?
"We've kept our dignity throughout. We've kept our counsel. That is the right thing to do in these situations. We'll keep it that way too, and just concentrate on the game."
Ferguson has no concerns about Evra's ability to keep his cool after the United captain was subjected to constant barracking from the Liverpool supporters in United's FA Cup defeat at Anfield recently.
"Patrice has handled it well," said Ferguson. "I don't think he enjoyed the abuse he got at Anfield but it happens.
"Gary Neville had it for 15 years. Wayne Rooney gets it when he plays against them. We expected that and so did Patrice."