Aberdeen manager Craig Brown wants to sign three more players before the start of next season - including two goalkeepers.
One of those would be a short-term loan to cover for Jamie Langfield, who suffered a seizure last month and is out of action until the autumn.
BBC Scotland has learned that the loan goalkeeper would be one who can go straight into the first team.
Meanwhile, young German Daniel Strahle will return to the club on trial.
The 20-year-old, who has been with German third-tier outfit Aalen, has already spent time at Pittodrie and will do so again when the Dons resume pre-season training on Thursday.
He has impressed goalkeeper coach Jim Leighton.
The 22-year-old Juan Carlos Mesquida Nunez - who plays in Spain's fourth tier for Majorca-based side Felanitx - will also go on trial, although any deal for the midfielder would be a long-term project.
Joining the other two trialists will be 21-year-old former West Ham forward Daniel Uchechi, a Nigeria international team-mate of Sone Aluko, who has enjoyed four years at Pittodrie, and who is contracted to Dender in his homeland.
However, Brown's signing focus is on the two goalkeepers and a midfielder, with a move for former Rangers, Dundee and Cardiff City veteran Gavin Rae still on the radar but unlikely.
There may be as many as six trialists with the Dons when the players meet up again this week.
As for Aluko, while a move to a team in the Midlands in England is his preference, he is still without a club and would be welcomed back into the fold at Aberdeen.
Brown also dismissed reports that 18-year-old midfielder Fraser Fyvie is on the verge of a move to English Premier League side Fulham.
"I haven't heard anything and, if there had been any contact, I would have been told," he said.
A possible return for out-of-contract defender Zander Diamond has been dismissed following the arrival of former Panserraikos centre-half Youl Mawene.
However, Brown has sympathy with Diamond's plight after a potential move to Hearts collapsed because of concerns over an ankle.
"It's a real shame for Zander," added the Dons manager.
"He had 11 years here and doesn't deserve what's happened to him, but he'll find a club, I'm sure of that."
Meanwhile, Brown confirmed that Rangers had made no approach about taking Richard Foster back to Ibrox on a permanent deal following his season-long loan and that the versatile wide man will return for pre-season training.