After starting his professional career in Šiauliai, he was best known for playing in Lithuanian champion Žalgiris and Pallacanestro Reggiana.

Slanina also was member of Lithuania national team, winning gold medal in Eurobasket 2003.

In July 2015, Slanina was named the assistant to head coach Massimiliano Menetti, at Pallacanestro Reggiana, the club where he finished his playing career.

[1] After the 2016-17 season, Slanina contract was not renewed by Pallacanestro Reggiana, but the Lithuanian and his family continue to live in Reggio Emilia.

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