"In addition, there are matches against Georgia, Namibia and Argentina Jaguars for Scotland A in the IRB Nations Cup.
"So, from my perspective, we are playing six Test matches this summer and that will be reflected when we announce the Scotland A squad next week."
Robinson revealed he would consider adding a player to his squad, which could pave the way for Hines to feature after he was given compassionate leave to spend time in his native Australia helping care for his mother-in-law.
Thompson 'chuffed' at Scotland call
"He's going back to see his wife, who has been over in Australia nursing her sick mother," said Robinson.
"It's time for him to be there and if Nathan feels he can come across to Argentina at a later stage then we will leave that open for him to be able to do."
The first Test against the Pumas takes place on Saturday 12 June, with the second a week later. Both matches will be shown live on BBC Two Scotland, with radio commentary and website streaming.
Scotland squad for Argentina tour: Backs: Blair (Edinburgh), Cusiter (capt, Glasgow), Danielli (Ulster), De Luca (Edinburgh), M Evans (Glasgow), Godman (Edinburgh), Grove (Worcester), S Lamont (Scarlets), R Lawson (Gloucester), Morrison (Glasgow), Parks (Glasgow), Southwell (Stade Francais), Thompson (Edinburgh).
Forwards: Barclay (Glasgow), Beattie (Glasgow), Brown (Glasgow), Dickinson (Gloucester), Ford (Edinburgh), Gray (Glasgow), Hamilton (Edinburgh), Jacobsen (Edinburgh), Kellock (Glasgow), S Lawson (Gloucester), Low (Glasgow), MacDonald (Edinburgh), Murray (Northampton), Strokosch (Gloucester).
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