The Swiss star’s decision comes following a three-month spell which has seen him surrender the French Open title, losing in the quarter-finals, slip to number three in the rankings behind Rafael Nadal and Novak Djokovic and also fail to reach the Wimbledon final for the first time since 2002.
“I’ve been looking to add someone to my team and I’ve decided to spend some days with Paul Annacone,” Federer said on his official website.
“As Paul winds down his responsibilities working for (Britain’s) Lawn Tennis Association, we will explore our relationship through this test period. Paul will work alongside my existing team and I am excited to learn from his experiences.”
Although Darren Cahill, Jose Higueras and Tony Roche have all worked with Federer on a temporary basis, he has not had a full-time coach since splitting from Swede Peter Lundgren six months after winning his first Wimbledon title in 2003.
Under Annacone’s guidance, Sampras won nine of his 14 Grand Slam titles and Federer will hope the 47-year-old American can help him out of a rut which has left him without a title since the Australian Open in January.
The 28-year-old now holds the record for Grand Slam victories, having won six Wimbledon titles, five US Opens, four Australian Opens and one French Open in all.
He had also reached 23 consecutive Grand Slam semi-finals before losing to Robin Soderling at Roland Garros.
Federer is due to return to action in Toronto in August after taking a month-long break from the ATP World Tour.