EU regulators looked into Apple's mobile payment service and found it was not market dominant but they could review it again if they receive formal complaints, Europe's antitrust chief said on Monday.
In an interview with Reuters, European Competition Commissioner Margrethe Vestager also signalled that Google and Amazon would remain very much on her radar until the end of her mandate late next year.
Google has been fined a total of 6.8 billion euros ($7.7 billion) in the last 18 months for breaching EU rules.
Apple's mobile payment service Apple Pay, launched in October 2014, is available in 10 EU countries including France, Italy, Spain, Sweden and Denmark.
Critics say that an NFC chip embedded in the Apple iPhone means that Apple Pay is automatically selected when an iPhone user pays for goods and services, barring rival payment methods. The Danish Competition Authority is investigating the issue, which was brought to its attention by the Danish Consumer Council.
Vestager, who has earned a reputation for taking a tough line against companies that breach EU rules and can impose fines of up to 10 percent of a company's global turnover, said she did a preliminary review some time back.