Everton midfielder Tim Cahill admits losing team-mate Steven Pienaar would be a 'big loss'.
Pienaar put in a number of excellent performances for the Toffees last season but has not put pen-to-paper on a new contract as he looks to focus on the World Cup.
The South Africa star is set to play in the tournament's opening game against Mexico in Johannesburg on Friday, but his domestic future is yet to be resolved.
There has been reported interest in the 28-year-old from big clubs and Everton will hope he signs a new contract as he only has one year remaining on his existing deal.
Cahill, who signed new terms for four years at Goodison Park last month, says Pienaar is a top player, and hopes he decides to stay.
"Pienaar is a great player," the Australia international told Everton's official website. "A good character who is good for the team and we are good for him.
"I have to respect his decision (to wait for contract talks) because I am a professional and I know that he is one of the biggest players for South Africa.
"Losing him would be a big loss but I think he needs to see what he would be losing if he left Everton.
"Hopefully we will sign him because it is a pleasure playing with him."
Pienaar has been at Everton for more than two years after initially joining on loan from Borussia Dortmund.
One factor that could convince him to remain on Merseyside may be manager David Moyes, for whom he has great praise.
Pienaar remarked: "The gaffer has always been there to help me.
"He's the one who took me to England and had a lot of confidence in me.
"When someone shows you that kind of respect you want to pay them back someday and all I had to do was work very hard because I knew that the talent was there.
"He demands a lot from his players and always emphasises teamwork.
"I've often wondered when he gets the chance to go to sleep because he is the hardest working manager I've ever come across and that has rubbed off on his players as well. Everyone has to give 100% no matter how good you are."