Rangers have confirmed the signing of Dundee United striker Jon Daly.
St Mirren defenders Sean Kelly and Jason Naismith have signed new one-year contracts with the club.
Coloccini looks set to leave the Magpies after informing the club of his desire to return to Argentina, though they are keen to keep hold of their skipper until the end of the season.
His father Osvaldo, currently a youth coach at San Lorenzo, believes a resolution must come quickly.
"Fabricio is very anxious, he wants a resolution," he explained. "I think that it's the moment for him to return to San Lorenzo. We want him to come back.
"In the last few hours, Newcastle have bought a defender but that means nothing because they were looking for an option in that position anyway.
"At Newcastle they are telling him to wait until May but the thing is that I don't know if San Lorenzo are going to be able to wait until then."
San Lorenzo manager Bernardo Romeo added: "We need a central defender. We are waiting. Let's have faith in that the transfer will be done, otherwise we will have to go out and look for another central defender."
The 31-year-old centre-back spent time on loan at San Lorenzo from AC Milan more than a decade ago.