The Daily Record say Portuguese duo Dalcio and Fabio Cardoso are due in Glasgow today to complete medicals after deals were agreed with their respective clubs to move to Ibrox.
Vitoria Setubal centre-half Fabio Cardoso and Benfica attacker Dalcio are both due to report to the club's training base on Monday morning after Caixinha accompanied the pair on a flight from Lisbon.
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"I respect the umpires and I never like to criticize them because I know they give their very best, but they got that one wrong". C Chris Stewart was reinstated from the 10-day disabled list and C Jacob Stallings was optioned to Triple-A Indianapolis.
Dalcio is a 21-year-old Benfica forward but has yet to play for the first team, although he has top-team experience with Belenenses.
Jack became Rangers' second summer signing with Portugal global veteran Bruno Alves announced a day earlier on Wednesday.
He previously worked with Caixinha at former side Santos Laguna and will have to be granted a work permit in order to play in Scotland.
The striker has nine Mexico caps and three global goals to this name, with the new man set to be tasked with firing Rangers into contention domestically.