Olympic heptathlon champion Jessica Ennis-Hill will miss the indoor athletics season with an Achilles injury.
The 30-year-old Briton said she is “really frustrated” but wants to be “100% ready” to defend her Olympic title in Rio in August.
The indoor season gets under way in Glasgow on 20 February.
“We’re still in February, there’s a lot of time before the Olympics,” Ennis-Hill told Sky Sports.
“I’ll be going away and sitting with the medical team to go through everything. Hopefully it won’t impact on my summer.”
Ennis-Hill struggled with an Achilles problem in 2013 and missed the World Championships in Moscow that year.
She also missed the entire 2014 season as she gave birth to her son.
Ennis-Hill returned to training in Autumn that year and went on to win heptathlon gold at the 2015 World Championships in Beijing.