County boss Dave Challinor, who signed a new three-year deal 24 hours earlier, said he was “great business” to sign Olowu and knows the player thought hard about leaving the Keepmoat Stadium.
“I know it was a big decision for him, as he’d had a great season and enjoyed his time there,” Challinor said.
“He was a player that we tried to sign in January, but understandably Doncaster wanted to keep him in to assist in their objective, which they achieved.
“To pick him up on a free transfer is great business for us and in my opinion we have a player who is in his prime years, but also has real development in him.”
Stockport are preparing for another shot at promotion from League One next season after losing in the semi-finals of the play-offs last term.