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On 5 July 2019 it was confirmed by Grasshopper Club Zürich, that Ben Khalifa had returned to the club on a 1-year contract with an option for one further year.

He then came back to Switzerland, and on 21 October 2016, he signed with Lausanne-Sport, where he had already played as a youth. He scored his first goal for them during his fourth appearance, a 1–2 loss against Young Boys.

In January 2015, Grasshopper manager Michael Skibbe ended his contract with Grasshopper and went on to manage Turkish club Eskişehirspor, with Ben Khalifa following him there. After a brief loan spell at Belgian club KV Mechelen, Ben Khalifa resigned from Eskişehirspor in July 2016.

In his second year to his loan spell at Grasshopper, Ben Khalifa scored in the qualification round second leg of Europa League, in a 1–0 win over Fiorentina, but remained out due to Fiorentina's away goal. After scoring three goals in twenty appearance, Ben Khalifa scored twice, as Grasshopper thrash St. Gallen 5–1 on 17 February 2014. Towards the end of the 2013–14 season, Ben Khalifa tore his ACL during a 4–2 win over Sion and will be out for six months, as well as, missing the rest of the 2013–14 season and the start of the 2014–15 season. He would finish his second year to his loan spell at Grasshopper, where he made twenty-four appearance and scored five times.

On 5 May 2014, Ben Khalifa joined Grasshopper on a three-year contract.

On 23 June 2012, Ben Khalifa signed a two-year loan deal with his first professional club Grasshopper for the 2012–13 season. He made his debut since coming back two years ago, as Grasshopper lose 2–0 to Sion, in the opening game of the season and on 28 July 2014, he scored his first goal for the club, in a 2–2 draw against Basel. He would later score six goals in thirty-three appearance and helped the club win the Swiss Cup after beating Basel on penalty-shootout, ending a ten-year drought.

After half a season on the bench, Wolfsburg loaned Ben Khalifa out to 1. FC Nürnberg until summer 2012, where he made his Bundesliga debut on 5 March 2011, being brought into the game against FC St. Pauli in the 82nd minute.

After the loan spell with Nürnberg, in July 2011, Ben Khalifa moved to BSC Young Boys on loan for the 2011–12 season The previously year, Ben Khalifa was linked with a loan move to Young Boys, but the club's general manager Dieter Hoeneß made it clear, quoting on Ben Khalifa: "This is not an issue at this time!"

He made his debut for the club, in the third round of Europa League, where he played in both legs, which in the second leg, he made a double assist to send the club through to the next round. In the Europa League play-offs in the second leg, Ben Khalifa was sent off in the 62nd minutes after he was involved in an incident with Quim, as Young Boys drew 2–2 with Braga, but were eliminated due to away goal. While at Young Boys, Ben Khalifa made seventeen appearance and scoring against Neuchâtel Xamax on 21 September 2011 and Thun on 10 December 2011.

On 19 February 2010, he signed a four-year contract with VfL Wolfsburg of the German Bundesliga and joined his new club on 1 July 2010. He attracted interest from Premier League club Arsenal and Serie A side Inter Milan, but Wolfsburg managed to beat both clubs to sign him. However, he has never played for Wolfsburg in a Bundesliga game.

Ben Khalifa spent the first half of the 2010–11 season, playing in the club's reserve, where he made his debut, in a 4–2 win over Türkiyemspor Berlin on 20 August 2010. Ben Khalifa made six appearance scoring two goals against Magdeburg on 19 September 2010 and Oberneuland on 1 October 2010. He later stated about playing in Regionalliga, citing: "This is discussed with the trainer. I want to play with the reserve, than sitting in the Bundesliga in the stands."

German Newspaper Westdeutsche Allgemeine Zeitung named Ben Khalifa, along with two other players, as the worst signing since the winter transfer 2010.

At the age of only 18, he made his debut for the Swiss U-21 squad on 26 May 2010 against Turkey.

For the 2010 FIFA World Cup in South Africa he was on Switzerland's reserve list (30 players), but did not make it into the final 23-man squad. His first appearance for the Swiss national team was on 11 August 2010 against Austria.

Ben Khalifa made his debut with Grasshopper in the Swiss Super League on 7 March 2009, at the age of 17, where he played the last 11 minutes in the game against FC Sion. He scored his first Super League goal in his fourth game, on 19 July 2009, also against Sion. Until he left Grasshopper at the end of the 2009–10 season, Ben Khalifa played a total of 28 league matches and scored eight goals. The club would find themselves in the financial difficulties and would need to sell him. As a result of moving, the sale of Ben Khalifa helps the club solve their financial difficulties.

Ben Khalifa has played for Swiss youth squads at various levels from U-15 to U-18. He has participated at the U-17 European Championships in 2008 in Turkey and in 2009 in Germany as well as at the Under-17 World Cup in 2009 in Nigeria, where he was awarded the "Silver Ball" trophy for the second best player of the tournament.

Nassim Ben Khalifa (born 13 January 1992) is a Swiss footballer who plays for Grasshopper Club Zürich and the Switzerland national football team.