Both players made their name at the Estadio Jose Alvalade, paving the way for moves to the Premier League in the space of just 12 months of each other.
Southampton signed right-back Cedric for a bargain £3.6 million, according to the Guardian, while the BBC reports that Leicester paid a club record £29 million to bring Slimani to the King Power Stadium.
And a return could now be on the cards for Cedric and Slimani. A Bola claims that Sporting president Federico Varandas is eyeing an ambitious double-deal that would see the Portuguese and Algerian internationals play in the green and white stripes again.
Cedric has just a year left on his contract at Southampton, who have made him available for transfer after the defender failed to impress during a loan spell at Serie A giants Inter Milan.
Slimani, meanwhile, has never looked suited to English football. The veteran target man has spent the 2018/19 campaign at Fenerbahce, scoring once in 15 Super Lig games.
And A Bola adds that he is willing to lower his wage demands to seal a return to Lisbon.
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