The striker has agreed his settlement with Birmingham City, allowing him to at last join the squad for pre-season training when they return from Norway.
After starting his career at Darlington, the Middlesbrough-born forward then spent five years at Bradford and helped the Bantams into the top-flight in 1999, scoring the winning goal in a 3-2 victory at Wolves to clinch the club's place in the Premiership.
A £1m move to Burnley followed in 2002, with Blake a big hit at Turf Moor as he scored 51 goals in 137 appearances, sparking his switch to Birmingham.
Kevin Blackwell said in the Yorkshire Evening Post: "We've been talking for a week or so now and I'm pleased we've been able to get things sorted. It's been no secret that I was keen to have Robbie on board and, subject to his medical, we've now finalised things.
"He's got proven ability at this level and his goal-scoring record is second to none. He gives us something different because he can play up front or out wide, left or right, or drop in behind the strikers.
"Over the past few years he's been proven to be one of the best in this division and I'm pleased we've been able to bring in another top striker.
"I wanted competition in all areas. I don't want people resting on their laurels and taking it easy."