The playmaker had moved back to the Merseyside club after he was deemed surplus to requirements at his parent club Tottenham, but the 30-year-old admitted he has no clue where he will be plying his trade next season.
After Everton's 3-1 victory over Newcastle, the midfielder told Everton TV: "It's hard. The first time I left I didn't say goodbye, this time around it's a bit sad. I just want to say thanks for the support from day one. I really appreciate it.
"It means a lot to me, this club. Let's just see what will happen in the summer."
|Moyes refuses to celebrate seventh
Pienaar, who originally joined David Moyes' side from German club Borrussia Dortmund in 2007, returned to the club after hardly featuring for Spurs.
The midfielder had an immediate impact and played an integral role in his 14 appearances, helping Everton finish in seventh place and above local rivals Liverpool for the first time in seven years.
The South Africa international added: "Finishing above Liverpool is [an] unbelievable feeling and in the second half of the season the guys were fantastic. I was glad to be a part of that.
"For me it was important to finish the way I started - with a goal. I think my loan spell went well. I am pleased with myself.
"Don't forget, I didn't play much in the first half of the season and the only way I could pay the manager and the supporters back was by performing and I think I did quite well."