Regardless of the Swiss legend's performance in the Netherlands he could still yet go to world number one the following week if Nadal fails to reach the last four at the Dubai Tennis Championships - an event Federer is virtually guaranteed to skip.
The Spaniard is full steam ahead with planning this year's schedule despite being on the mend from an injury suffered in the Australian Open quarter-finals.
Federer sets tone for 2018 and will the floodgates now open for Wozniacki?
Roger Federer will bid to replace Rafael Nadal as world No 1 when he competes in Rotterdam next week. "It feels good to join in the celebrations of the 45th edition".
"The tournament is special for me", Federer, a two-time victor in Rotterdam, said in a statement. "I remember playing for the first time in 1999 as it was one of the first events where I got the chance to play at the highest level".
Now ranked number 2, Roger Federer has the opportunity to leapfrog Spanish Rafael Nadal and take over the number 1 spot next week if he gets to the Semifinals, Sky Sports reported.
At 33 years and 13 days, Andre Agassi remains the oldest man to be No. 1 in the world. Federer, 36, first rose to No. 1 14 years ago on February 2, 2004 and holds the record for most weeks spent at No. 1 (302).
This year's Rotterdam field also features Grigor Dimitrov, Stan Wawrinka, Alexander Zverev, David Goffin, Jo-Wilfried Tsonga, and Tomas Berdych.
The British number one, 30, had hip surgery in last month after pulling out of the year's first major, the Australian Open, and has targeted a comeback for the grass-court season.