City youth academy product Rusnak, who was offloaded in the winter, has netted six goals in 17 outings in Holland which has attracted the interest of Saints boss Ronald Koeman and the talented attacking midfielder is not against the possibility of a return to England.
"I've been looking at how Southampton have been playing this season," he told talkSPORT's Hawksbee and Jacobs.
"They are playing a style of football the top clubs in Holland are trying to play. They build from the back.
"Ronald Koeman's doing a great job. We'll see what the future holds."