The Riversiders are looking to secure a playoff spot this season after missing out on doing so narrowly last term.
They are reshaping their squad in the ongoing transfer window and have brought in players including Niall Ennis and Leopold Wahlstedt.
Blackburn are still likely to make further additions to their options before the transfer window slams shut on Friday night.
Tomasson is keen on bringing in three new faces to take his squad through until the January window.
Whether the Dane will succeed in adding the number of players he wants remains to be seen.
The Riversiders are currently in ninth position in the Championship standings this season after two wins from their four matches.
And they are hoping that further additions to their squad will hand them a significant boost this season.
