St Kilda ruckman Billy Longer will be sidelined for the next month after presenting with some concussion related symptoms recently.

The 23-year-old received a head knock late in a game for Sandringham against Collingwood on 7 May and subsequently passed all the concussion protocols, which allowed him to play the following week.  

Longer recently reported he experienced headaches from a bump at training, and also had some issues with his memory and recollection.

GM – Football Performance Jamie Cox said that after consultation with specialists the club has decided that Longer will spend the next four weeks out of competition and contact drills.

“Billy reported some concussion related symptoms following a head knock in the VFL that have required further investigation,” Cox told saints.com.au on Friday.

“Club doctors, in consultation with specialists, have recommended he spends the next four weeks on a modified program, out of playing and contact drills.

“With any concussion related incidents, player welfare is paramount. We will take a conservative approach with Billy and he will be monitored closely over the next month.

“He can continue conditioning work and modified non-contact skills, which will set him up for a strong second half of the season."