Tevez has been struggling with a hamstring injury and even though he made a substitute appearance in Tuesday's win over Tottenham, Mancini knows the South American is far from 100% and must choose whether to start with him against Stoke or put him on the bench.
Gareth Barry (hamstring) has recovered, meaning the only absentees will be Kolo Toure, who remains suspended, and Jerome Boateng (knee).
Mancini has warned his players beating Stoke will be harder than disposing of Manchester United in the semi.
After clinching a coveted top-four berth by beating Tottenham on Tuesday, Mancini's men are now odds-on to end their 35-year trophy drought at Wembley.
But Mancini is trying to dampen down expectations. In their own semi-final destruction of Bolton, and by putting Arsenal to the sword at the Britannia Stadium last weekend, Mancini realises Tony Pulis' outfit are a more complete team than many give them credit for.
"Saturday will be harder than United," he said. "Stoke are a strong team and a very difficult team.
"If we want to win we need to play very well. We should pay attention in every situation. We cannot concede anything. To think Stoke are an easy team would be a mistake."
Injured Stoke pair Robert Huth (knee) and Matthew Etherington (hamstring) are due to have fitness tests.
Huth is having sugar injections after coming off in the victory over Arsenal which stretched their run to one defeat in nine games.
Goalkeeper Thomas Sorensen, a regular in cup games, is expected to retain his place but Ricardo Fuller, Danny Higginbotham and Mamady Sidibe are ruled out through injury.
Pulis believes the power of the people could see his club lift the Cup for the first time in its history.
Pulis has nothing but praise for the club's raucous supporters as they prepare to face City.
Stoke may be the underdogs but go into the final showdown in a rich vein of form after only one defeat in nine games.
Pulis said: "We have built a community club over the last five and a half years that the supporters have really grasped and taken us forward.
"It has not been the players, it has not been the chairman or coaching staff, it has been the whole community that has done this.
"The FA Cup is about dreams. I have watched City a couple of times and they are a very good side with excellent players. I am sure next year they will move up an extra gear.
"They are an emerging force and we know what sort of task we are facing. But we are determined the players are relaxed and the supporters have a great day."
Source: DSG
