The 21-year-old joined Wafa as a teenager before he was offered a lucrative deal to Austria last season.
“I am not surprised with anything I have seen at Wafa. My former colleagues have matured and have learnt how to play in the league,” Tetteh told Ghanasoccernews.com.
“Initially, they didn’t know how to win away games, but this season they are winning those as well and that is helping their course as a team. The scoreline [against Hearts] will shock many but like I said, the players want to make a name for themselves before they join other clubs locally or abroad.
“It’s been a good season for them and I am proud of what they have achieved so far as a team. I think winning the league will be a plus for them and I am confident that with what I have seen and the fact that they have started picking some away points, they can surely win it,” he said.
He added: “My advice to them is that, they should eschew complacency and focus on getting as many points as possible. I will be very happy to see them win the league for the very first time for the club and I know they are capable of doing it.”
Tetteh was part of the Ghana squad that reached the semifinals of the 2017 Afcon in Gabon.