The 23-year-old Bos had made a sterling start to the season with the Dutch club - earning the Eredivisie player of the month for September - before been hampered by a hamstring injury.
But the promising defender showed no ill-effects on Thursday night and is clearly on the comeback trail after coming on in the seven-goal thriller in Bucharest, where Feyenoord went down 4-3 to FCSB.
It was a deflating night for Feyenoord and their fans as Florin Tanase scored in time added on to inflict a third-straight loss in the competition for Robin van Persie's charges.
In Basel, second-half substitute Youri Tielemans hit the winner to help Aston Villa move a step closer to automatic qualification in the Europa League with a 2-1 win at Basel.
Villa's win on Thursday night left them three points clear inside the top eight with two matches to play and guaranteed themselves a play-off spot at the very least.
The Villans are joined at the top of the standings by Midtjylland, who beat Genk 1-0, and Lyon - 2-1 victors over Go Ahead Eagles at home.
Evann Guessand got Villa off to a dream start with his second goal of the Europa League campaign, but the home side grew into it.
Leo Leroy saw a goal ruled out for offside but Flavius Daniliuc was not to be denied an equalising goal moments later.
Tielemans replaced Matty Cash at the break and it took him just eight minutes to make his mark when he restored Villa's lead with a neat finish.
Basel had won their last seven Europa League matches at home which made Villa's victory at St Jakob-Park all the more impressive and stretched their impressive winning run to eight matches in all competitions.
In Utrecht, Igor Jesus entered in the 86th minute and still had time to score a late winner for Nottingham Forest in their 2-1 win against Utrecht.
The striker claimed his fourth goal of the campaign two minutes from time after Utrecht goalkeeper Vasilis Barkas was unable to hold Dan Ndoye's header.
Arnaud Kalimuendo gave Forest the lead early in the second half before Mike van der Hoorn equalised with a header.
Forest remain unbeaten in the second-tier competition with three wins and a draw since Sean Dyche took over as manager from Ange Postecoglou.
In the Conference League, Crystal Palace boosted their hopes of securing a top-eight finish in the standings after coasting to a 3-0 win over Shelbourne following a dominant first half at the Tallaght Stadium in Dublin.
Christantus Uche marked his first Palace start with an early opening goal, before Eddie Nketiah and Yeremy Pino put the Premier League side in total control ahead of the break.
Palace - looking to avoid a play-off round in February - could have added to their tally in the second half, but substitute Romain Esse saw his shot come back of both posts.
Oliver Glasner's side have nine points and sit ninth, just one point behind a group of five teams above them, ahead of a final league-phase fixture at home to KuPS of Finland.
with AP
