This article is brought to you by our exclusive subscriber partnership with our sister title USA Today, and has been written by our American colleagues. It does not necessarily reflect the view of The Herald.

Celtic target Niko Sigur credits clashes with ex-Ranger Rino Gattuso for his footballing rise.

The 22-year-old Hajduk Split talent could become manager Martin O'Neill's first signing in his third stint at Celtic.

Sigur, a right-back and defensive midfielder, had a rocky start to his football career.

He previously worked as a labourer and faced clashes with Gattuso during his tenure at Hajduk Split.

Sigur said: "Working under Gattuso was a special challenge for me.

"He often put me on the bench or out of my natural position, as if he was constantly...