Second-placed Inter stay one point behind Serie A leaders AC Milan who host champions Juventus later on Wednesday.
Inter played with the ferocity coach Antonio Conte had been demanding and Sassuolo barely had a sight of goal apart from a curled effort from Filip Đuričić that hit the outside of the right post.
Inter Milan forward Alexis Sanchez says he wanted to leave Manchester United right after first training session
Sanchez has explained his side of the story in a video on Instagram, admitting he immediately had a bad feeling about his switch to United.
Sanchez pulled up injured during his side's 2-1 quarter-final win over Bayer Leverkusen in Germany, and looks doubtful for Monday's semi-final against the Ukrainian side.
Alexis Sanchez has been on loan with Inter Milan since August last year after he struggled for playing time at Manchester United.
Inter dominated from the start but took until eight minutes from halftime to break the deadlock when Candreva fired home following a pinpoint assist from Sánchez.
Premier League: All clubs spend lot of money, Manchester City aren't the only ones, says Pep Guardiola
For Guardiola, who won back-to-back titles in 2018 and 2019, City are by no means unusual when it comes to spending big on players.
Inter Milan needed to win to hold off hard-charging Atalanta in the race for third and took the lead in the fifth minute when Young was left unmarked to volley in Sánchez’s cross.
Premier League: Manchester United boss Ole Gunnar Solskjaer says full-back Ashley Young nearing transfer to Inter Milan
Solskjaer said that Young will be 35 soon and if he gets a two-year contract elsewhere, it was up to him to take that as United weren't ready to offer him that
Premier League: Manchester United boss Ole Gunnar Solskjaer says Mason Greenwood should focus on improving, senior England debut will happen in time
Greenwood's eye-catching performances have led to calls for him to be handed his senior England debut but Solskjaer said the youngster first needs to focus on improving himself
Serie A: Inter Milan striker Alexis Sanchez undergoes surgery after picking up ankle injury during Chile's friendly against Colombia
Sanchez hobbled off in the 88th minute of a goalless draw in the friendly against Colombia in Alicante on Saturday.
Alexis Sanchez picks up ankle injury in Chile's goalless draw against Colombia, faces prospect of surgery
Chile striker Alexis Sanchez may need surgery on his ankle after picking up an injury in their 0-0 draw with Colombia last week, his club side Inter Milan have said.
Serie A: Inter Milan's Alexis Sanchez could be out for three months after suffering ankle injury on international duty for Chile
Chile play Guinea on Tuesday in another friendly but Rueda was worried that Sanchez might have to miss the start of South American World Cup qualifying in March
Serie A: Antonio Conte's back-to-basics style pays off as Inter Milan beat Sampdoria ahead of Champions League clash against Barcelona
Antonio Conte has returned to Italian football in style with Inter Milan flying high under his back-to-basics guidance, ahead of a Champions League trip to Barcelona that will test the Serie A leaders' continental credentials.
Serie A: Alexis Sanchez goes from hero to villain in Inter Milan's victory; Cristiano Ronaldo scores in Juventus win
Sanchez made a big impact in Genoa for Inter Milan, deflecting in Stefano Sensi's long-range opener after 20 minutes and tapping in another Sensi cross two minutes later before getting a red card.
Manchester United reveal record revenues of $780 million, absence from this Champions League to reflect in loss of earnings next year
United may be lagging behind Manchester City and Liverpool in the Premier League but are still making more money than their rivals
Argentina, missing the suspended Lionel Messi and several other European-based stars including Sergio Aguero and Angel Di Maria, enjoyed the better chances but were unable to find a goal in front of a sparsely populated Los Angeles Memorial Coliseum.
Premier League: Alexis Sanchez puts failure to shine at Manchester United down to lack of opportunities
Sanchez was signed with United placed second in the Premier League and aiming to close the gap on local rivals Manchester City
Serie A: Inter Milan manager Antonio Conte says striker Mauro Icardi has been treated correctly by club
Antonio Conte insisted on Saturday aggrieved Inter Milan striker Mauro Icardi has been treated correctly by the Serie A giants with new Chilean forward Alexis Sanchez set to make his debut against Cagliari.
Inter Milan striker Romelu Lukaku defends his professionalism in wake of criticism over fitness issues
Inter Milan striker Romelu Lukaku defended his professionalism in the wake of criticism over his weight towards the end of his time at Manchester United.