The veteran wants to play on beyond this season, but has previously noted that he doesn't want to line-up against his former club Chelsea.
"He has been vital", said Bruce.
Terry turned down Premier League offers last summer as he didn't want to face Chelsea competitively, having made over 700 appearances for the side over an 18-year professional spell in West London.
"He is calm. People like [Jack] Grealish have looked up to him and thought: 'Is that the way I've got to be to be a top player?'"
Despite the elderly age of 38, Terry has become a key member of Villa's defence, starting in 32 games in the league, with the Birmingham side finishing a respectful fourth spot, earning a play-off place.
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And it seems they are staying true to their word.
Terry has an emotional connection to Chelsea. When we played them earlier in the season [and lost], we weren't at full strength, and when we played them towards the back end of the season [and won], they weren't at full strength.
Football fans are in disbelief that Terry would even consider signing such a contract.
Ironically, despite his recent goalscoring form, one of the few clubs you can surely rule Mitro out of playing for next season, is Newcastle.
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Steve Bruce went on to have some very kind words about Terry.
Terry has been one of the standout defenders in the Championship this season, starting 32 league games and forming an effective partnership with Welsh global James Chester at the back. "He is a great leader of men, which we don't produce many of any more".
"That's what we've brought him for, not just to win a game on a Saturday but his overall contribution".
"Obviously I don't train against all the other [players] every day of the week, but just his attitude, his work rate, everything he puts into training, on the pitch and in the gym is just incredible", Ream said. "He's never let us down".
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