
Staying for a season, 22-year-old Tierney has made over one hundred appearances over his still-young career and is hoping to bring both goals and assists to the side.
Speaking via the club's official website, Ross said; "I’m really happy to join Walsall.
"I’m still only 22, but I’ve played a lot of games at senior levels so once the gaffer said he wanted me, I was happy to come.
"I know Oisin and I spoke to Conor Wilkinson at Motherwell as well and everything they’ve both said about the club made me excited to come down.
"I’m an energetic, attacking midfielder and I like to link up with the strikers so hopefully I can pitch in with some assists and goals.
"I want to play games, kick on here at Walsall and have a good season."