[10] On 8 June 2016, Manias signed a two-year contract with Belgian Pro League club Westerlo for an undisclosed fee.
On 5 April 2017, he netted a hat-trick, including one penalty, against AEL, helping his club to a 4–1 away win in their effort to avoid relegation.
[14] On 23 April 2017, in a crucial Superleague game against Veria, he netted a second hat-trick in a month, but he didn't not succeed to help his club to acquire a positive result, as they faced a 4–3 away loss.
[19] On 10 March 2018, Manias put the visitors, who beat high-flying PAOK 3–2 last weekend, ahead in the 69th minute in a 1–1 away draw against Panathinaikos.
On 22 September 2018, Manias helped the club to collect their first points of the fledgling 2018–19 season after seeing off fellow early strugglers Apollon Smyrnis 2–0 at the Theodoros Kolokotronis stadium, by scoring with a wonderful kick after Martín Tonso's assist.
[26] On 17 May 2019, Manias signed a three years' contract with Ekstraklasa club Pogoń Szczecin for an undisclosed fee.
[29] On 28 September 2022, Manias signed a contract with Hong Kong Premier League club Kitchee.
He scored 2 goals in his first two appearances for Kitchee, one in Hong Kong Premier League and one in Sapling Cup group stage.