UPDATE 1-S.Africa's Naspers offers to buy Poland's Bankier.pl

* Offered to buy 100 pct stake for $19.3 mln

* Bankier.pl to be integrated with Allegro

* Shares up 3.99 pct

(Adds details, shares)

JOHANNESBURG, June 10 (Reuters) - Naspers (NPNJn.J), Africa's biggest media company, said on Wednesday it has offered to buy 100 percent of Polish Internet portal Bankier.pl BAPL.WA from MCI Management MCIM.WA for $19.3 million.

The company said it was making an offer for all the shares of the Warsaw-listed Polish financial portal Bankier.pl. It added that one of Bankier's current shareholders had irrevocably committed to tender its 18.4 percent holding.

Bankier.pl will be integrated with Naspers' Eastern European Internet business Allegro -- which runs e-commerce trading platforms in Hungary and Czech Republic.

Shares in Naspers rose 3.99 percent to 201.84 rand by 1248 GMT, outperforming a firmer JSE Top-40 index .JTOPI of blue-chip stocks.

(Reporting by Gugulakhe Lourie)