Roger Federer is expected to play in his home tournament at the Swiss Indoors in October.
Federer is a record 10-time winner at the event in Basel, having not lost a match there since 2013, and won the last of his 103 titles there in 2019.
The 20-time Grand Slam champion has not played since Wimbledon in July 2021 and underwent knee surgery later that year.
The 40-year-old is also planning to play for Team Europe in the Laver Cup event in London in September.
A tournament statement said Federer had entered under his protected ATP ranking of nine.
He will play his opening match on Tuesday, 25 October.
The tournament, which will be staged for the first time since 2019 after cancellations caused by the Covid-19 pandemic, will start on 24 October.
Nadal expected to make return in Madrid
Meanwhile, Rafael Nadal is set to play at the Madrid Open next week following a spell on the sidelines with a rib injury.
The 35-year-old, who won the Australian Open earlier this year, picked up the injury during a win over fellow Spaniard Carlos Alcaraz in the Indian Wells semi-final on 20 March.
Nadal went on to lose the final against Taylor Fritz the following day before being ruled out for between four and six weeks on 22 March.
“Despite arriving just before the tournament and preparation being difficult, I really want to play at home since the opportunities are few,” Nadal wrote on social media.
“So I’m going to try to do it in the best way I can. See you in Madrid.”
The 21-time Grand Slam champion’s expected return will be prior to the French Open, which begins in Paris on 22 May and a tournament he has won a record 13 times.
