The 64-year old was part of the Black Cats' 1973 FA Cup-winning side before helping City to the 1976 League Cup and is enthusiastic to see who will come out on top in Sunday's cup final at Wembley.
Tueart had two spells at Eastlands, prompting him to pledge his allegiance to City, and has indicated that he feels Manuel Pellegrni's side will come out on top because of two key players.
"I thought at one stage during the first half of the season, we (City) were in danger of becoming a two-man team with Aguero and David Silva - two fantastic player, two world class players," he told Sky Sports News.
"If those two play, it will be really important to Man City and tough for Sunderland.
"Your big players have to perform and what will interest me is the strategy of the manager - we have got highly skilled individual players and I'm sure Manuel Pellegrini will want to get his first trophy in the cupboard.
"Gus Poyet has got a very well organised, very disciplined and a very work ethic team. So it will be a contrast of two different sides for me."
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