He reiterated his opinion in an interview with another South African newspaper on Sunday, telling City Press: "Israel is an occupier country which is oppressing Palestine, so it is not proper for South Africans to associate with Israel,
"We discourage people from going there except if it has to do with the peace process."
His comments come amid worsening relations between Israel and South Africa. Earlier this year the Trade and Industry Minister called for labelling of produce from the settlements.
Also in May, a scheduled talk by an Israeli envoy was cancelled at the last minute by the University of KwaZulu-Natal, following pressure from pro-Palestinian activists.
Last year, the University of Johannesburg voted for an academic boycott of Israel, despite longstanding ties with Israel's Ben Gurion University.