Antonio Rudiger, who moved for 35 million euros in Chelsea, became another player who left Roma in recent weeks.
Previously, the team left Mohamed Salah, who went to Liverpool, left for Zenit Leandro Paredes, as well as Mario Rui, who will continue his career in Napoli.
"Good luck to my friend Antonio Rudigeru in the new club," - wrote Strootman in his Instagram.
"I will miss our duels in training and talk in the locker room. But especially I will miss you on the football field ".
"I hope this was the last loss of Roma this summer," - summed up Strootman.
In addition to all the players listed above, Volkov left the goalkeeper Wojciech Szczesny, who returned after a two-year lease back to Arsenal.