Saints desperately need a few strikers, and Paatelainen would certainly fit the bill. He's big, strong and has a physical presence up front, and has a track record of finding the net. he is getting on a bit now, but Owen Coyle is ancient and still hammering them in for Airdrie United.
Saints face competition from Queen of the South for his services, and are believed to have offered some sort of player/coaching role. He hasn't ruled out staying in Perth, but hopefully he'll see sense and come to Paisley.