Celtic want to have a look at Real Valladolid keeper Jacobo and Nigerian striker Manasseh Ishiaku on trial.
The Bhoys are keen to provide competition for No.1 Lukasz Zaluska following Artur Boruc's summer exit to Fiorentina.
Valladolid shot-stopper Jacobo, full name Jacobo Sanz Ovejero, has a year left on his contract with the relegated Spanish outfit.
Manager Neil Lennon wants Jacobo on a five-day trial and he is expected to train with the Parkhead squad next week.
Valladolid president Carlos Suarez has confirmed talks for Jacobo, who could cost £600,000, are at an advanced stage.
"Talks with Celtic are at an advanced stage," he told the Daily Record. "If all the conditions are favourable for all parties I don't see a problem with the sale."
Meanwhile, Celtic, according to reports in Germany, have invited Nigerian hit-man Ishiaku for a spell with the SPL club.
The 27-year-old has been told he is no longer required at Cologne and is free to find himself a new side.
Ishiaku still has two more years on his contract with the Bundesliga outfit, but has scored just one goal in 28 league outings.