Copa America champions Chile are due to play Brazil on Thursday in Santiago before travelling to Lima for a clash with Peru on Tuesday.
"Neither Vidal nor Alexis are confirmed for the Brazil game," Sampaoli said at a pre-match news conference. Neither player has been in full training since travelling to join the Chile squad this week, he added.
Arsenal forward Sanchez left the field early during the second half of Sunday's encounter with Manchester United, after suffering what manager Arsene Wenger described as "a little groin problem".
Vidal missed Bayern Munich's last Champions League clash due to a knee injury and only played a few minutes of last weekend's Bundesliga game.
"Right now I see Arturo Vidal far from fit for the game, at least the first tie," said Sampaoli.
(Reporting by Felipe Iturrieta, Writing by Rosalba O'Brien, editing by Pritha Sarkar)
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