“We thank them all for their contributions to the club and we wish them every future success,” Arsenal said.
Ramsey is the most high-profile departure but fans have known about his decision to leave for some time.
The Welsh midfielder could not agree terms on a new contract after eight years as an Arsenal player.
The future of forward Welbeck is not yet known but he is fit again and said to be interesting a number of Premier League clubs.
Aaron Ramsey and Danny Welbeck are leaving Arsenal on a free (Image: GETTY)
Everton and West Ham are reportedly leading the way in the race to sign him whole Serie A side Lazio have also been linked.
Elsewhere, Cech is expected to join former club Chelsea in a non-playing role.
Fans were already aware that Lichsteiner after he posted on Instagram earlier this week.
“Dear Gunners,” he wrote.
Petr Cech is retiring from playing (Image: GETTY)
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Stephan Lichsteiner spent just one season with the Gunners (Image: GETTY)
“We were close to add an important chapter to this amazing club's history. But to be close ... is unfortunately not good enough.
“This is hard to accept. I'm very disappointed.
“It was our objective to bring Arsenal back on the highest international level and to win trophies. Both belong to this great club.
“I wish my teammates, my coach and his staff, all hard-working employees and all Gunner fans simply the best! I'm confident our team can complete our mission next season! I loved to be a part of this club.
“It was a great challenge and experience without a happy end, unfortunately. Thank you very much for your overwhelming support! It was much appreciated!”