Both players arrived under Paolo Di Canio's stewardship, but neither has featured prominently.
Centre-half Diakite came in from Lazio and has played in seven Premier League games, whilst midfielder Cabral - signed from Basel on a free - has made just one appearance.
Cabral is reported to be interesting a number of clubs in Italy, most notably Genoa.
Gus Poyet told the Sunderland Echo: "We are having a few chats with Cabral, and we will see what the future brings.
"He was either going to play for 90 minutes [against Carlisle] or not - I didn't think it was a good option for him to be on the bench.
"We have a decision to make."
Likewise, Diakite is being tipped to make the move, but his agent insists that, whilst returning to Italy is an option, with Verona, Sassuolo and Sampdoria all said to be keen, he could yet remain in England.
"In Italy, these hypotheses are viable and could be good solutions," Ulisse Savini is quoted by Calciomercato.
"But Modibo's goal, however, is to remain in the Premier League, at Sunderland or elsewhere."