The DP World Tour has banned players who competed in June’s Saudi Arabian-backed LIV Golf event from next month’s Scottish Open and fined them £100,000.
The players can also not play in the PGA Tour’s Barbasol Championship and Barracuda Championship in July.
The Scottish Open is one of the DP World Tour’s most lucrative events and is used by many players as preparation for The Open, held the following week.
The PGA Tour suspended 17 members who played in the inaugural LIV Golf event.
The DP World Tour, formerly known as the European Tour, has also warned players that “participation in a further conflicting tournament or tournaments without the required release may incur further sanctions”.
Lee Westwood, Ian Poulter, Sergio Garcia, Martin Kaymer and Graeme McDowell are the highest-profile DP World players who will be affected by these initial sanctions.
Players who have joined the LIV Golf series are allowed to play in the 150th Open Championship at St Andrews.
The next LIV Golf tournament in the $250m (£200m) eight-event invitational series is scheduled to take place in Portland, Oregon from 30 June to 2 July.
South Africa’s Charl Schwartzel claimed the first LIV Golf event at Centurion Club in Hertfordshire, winning $4.75m (£3.86m).
The Scottish Open will be co-sanctioned by the DP World Tour and PGA Tour for the first time this year as part of the ‘strategic alliance’ between the circuits.
It returns to The Renaissance Club from 7-10 July and has attracted a high-class field, with Scottie Scheffler, Collin Morikawa, Justin Thomas and Jon Rahm among those signed up to compete for the £6.5m prize fund.
Keith Pelley, DP World Tour chief executive, said:…