Australia head coach Michael Cheika described Anthony Foley as "a special person" after the Munster legend passed away on Sunday.
News of Foley's death has left Irish rugby in mourning, with tributes paid to the 42-year-old from across the globe.
Cheika was in charge of Leinster towards the end of Foley's Munster playing career and revealed the news had been weighing heavily on his mind.
“I would be lying if I didn’t admit that’s swirled around in my head all morning, when you wake up to news like that,” Cheika told reporters on Monday.
"When you compete against someone and you earn respect for them from competition, it shows there's a special person behind that.
"It's really tragic, our thoughts are with the Munster family and all of Irish rugby… as a colleague as well, as a head coach for a team, it's really sad."
The Wallabies take on New Zealand this weekend at Eden Park.