Els' management confirmed that its client will compete in the 2018 event, according to Golfweek.
On Christmas Eve, Els tweeted about receiving a "present" from the tournament, but he didn't elaborate.
In 2017, Els played in the Masters in the final year of a five-year exemption he received for winning The Open in 2012.
Els, 48, has never won the tournament in his career; he has three top-5 finishes and six top-10s. Els has been runner-up twice (2000, 2004) at the tournament.