Vidal already appeared to hint at international retirement following Chile's shock 3-0 loss to Paraguay in World Cup qualifying last week.
And the 30-year-old midfielder – veteran of 97 caps – discussed his future again after Chile suffered a 1-0 defeat in Bolivia in CONMEBOL action on Tuesday.
The result left Chile in sixth position – outside the play-off spot by a point.
In an Instagram post afterwards, Vidal wrote: "Sorry Chile for these two losses! We put everything in the field but we couldn't win.
"We will continue fighting!!! Two matches and the World Cup is what I have left, thanks for so much affection in all these years!!!"
Copa America champions Chile slumped to back-to-back defeats after Juan Carlos Arce converted a penalty for 10-man Bolivia.