BRUSSELS, July 11 (Reuters) - EU antitrust chief

Margrethe Vestager will hold a press conference at 09h00 GMT,

the European Commission said on Thursday without providing

details.

Vestager is expected to announce that Apple ( AAPL ) has

agreed to open up its tap-and-go mobile payments system to

rivals following a four-year long investigation, people with

direct knowledge of the matter said.