Young gun Cameron Rayner is no certainty to be selected at No.1 in Friday's national draft with the Brisbane Lions still weighing up the merits of four players for the honour.

The Lions did not reveal who the four were but Rayner and fellow Victorians Paddy Dow, Andrew Brayshaw, Adam Cerra and Luke Davies-Uniacke are all rated potential No.1 selections at a draft that is heavily populated with midfielders at the top end.

Paddy Dow is among a list of names that could be chosen first in the draft. Credit:Darrian Traynor

Rayner's prospects were not helped by his 2km time trial in front of recruiters on Friday in 7 minutes 57 seconds, however Brisbane Lions list manager Stephen Conole said there were reasons for the time recorded in what was a slowly run race with three other potential draftees.

"He had an exam the day before and he has got another one on Monday," Conole told SEN.