Paruyr Hairikian has been taken to hospital after being shot by an unidentified attacker on a central street in the capital on the evening of January 31.
A relative of Hairikian told that the 63-year-old opposition leader had been hit in the shoulder.
The wound is not believed to be life-threatening.
Police have launched an investigation.
Hairikian, 63, spent a total of 11 years in Soviet prison camps and a further three in internal exile for being a member of a clandestine political organization as well as for writing samizdat literature and pamphlets.
He is considered a leading candidate in next month's presidential poll.
Several political leaders have already visited the wounded Hairikian in hospital, including Prime Minister Tigran Sarkisian, who condemned the attack.