In April 1968, at the age of seventeen, Simionaș made his Divizia A debut for Dinamo Bacău by coming in for the last 20 minutes in a match against Progresul București.
[6] Simionaș is widely considered to be the most important player in the history of Politehnica Iași, having amassed 359 Divizia A games for them over a fifteen-year period.
He was part of the golden team of Politehnica and together with Mihai Romilă and Gabriel Simionov made one of the memorable midfield lines of the Romanian league.
[8] After 2005, Simionaș started to work as an observer for the Romanian Football Federation and also managed CSM Pașcani for a short period in 2013.
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