All three were on the books at Stamford Bridge but were sold on by the west London club.
They are now considered among the best players in the Premier League.
De Bruyne, who was at Chelsea from 2012-14, is being widely tipped to win the various player of the year awards that will be dished out at the end of the season such has been his form for Manchester City this term.
Lukaku moved to Manchester United for £75million over the summer and has 10 Premier League this season, but was sold by Chelsea to Everton in 2014.
Salah returned to the Premier League with Liverpool over the summer and has been sensational, scoring a staggering 14 goals so far this term. He was on Chelsea’s books up until 2016 but was only granted 13 Premier League appearances over his two years at Stamford Bridge.
Despite their respective incredible upturns since leaving Chelsea, former Blues captain Terry believes there should be no regrets at Stamford Bridge.
‘Not really, because at the time they didn’t make our team stronger,’ he told Sky Sports when asked if they should regret selling them.
‘Let’s not forget we were one of the best teams probably the Premier League has ever seen, in them early days when they arrived.
‘So they was coming into one of the best sides which was even more difficult.
‘When they come in can they make a big enough impact to sustain and keep their place? No, it’s very difficult to do.’
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Terry conceded it remains difficult for young Chelsea players to break into the team, but it’s not impossible.
‘That’s why I think, even at Chelsea, you look at [Andreas] Christensen he’s come in and done great, keeps his place. David Luiz is now out and fighting for his place.
‘When you’re a younger player like [Ruben] Loftus-Cheek coming in, can you set the world alight in a cup game or whatever game you’ve been given? The last group game of the Champions League?
‘I don’t think that’s enough for these boys to go “that’s enough game time to show I’m a Chelsea player”. I think unfortunately he then has to go away to a Crystal Palace. For me he’s good enough to come back to Chelsea. But sometimes you have to go away. I done it when I was younger.’
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