Cologne, relegated from the Bundesliga last season, guaranteed promotion on Monday with a 4-0 win at Greuther Fuerth.
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Bundesliga champions Bayern Munich bounced back from their Champions League disappointment with a 3-1 win at relegated Cologne.
Hector, 27, was reported to be interesting clubs including Bundesliga rivals Bayern Munich and Borussia Dortmund and Serie A leaders Juventus.
Relegation-troubled Cologne have appointed Markus Anfang as coach for next season, when the club will most likely be playing in the second division.
Cologne coach Stefan Ruthenbeck will leave at the end of the season regardless of whether his side manages to stay in the Bundesliga.
Goalkeeper Zieler, born in Cologne, was targeted during the second half of Stuttgart's 3-2 away win.
Cologne has imposed a two-year stadium ban on a supporter who they determined verbally abused Stuttgart goalkeeper Ron-Robert Zieler.
Ex-Leicester keeper Zieler, born in Cologne, was targeted by a section of the home fans during the second half of Stuttgart's 3-2 away win.
Former Leicester City keeper Zieler was targeted by a section of the Cologne support during the second half of Stuttgart's 3-2 away win on Sunday.
Michy Batshuayi marked his Borussia Dortmund debut with a pair of goals before Andre Schurrle netter a winner in a 3-2 victory at Cologne on Friday.
Ruthenbeck took over at the Bundesliga's bottom club following the departure of Peter Stoger.
A Robert Lewandowski goal ended the resistance of rock bottom Cologne as Bayern Munich extended their Bundesliga lead to nine points with a 1-0 win.
Two penalties in the final minutes of the match saw winless Cologne capitulate as they threw away a 3-0 lead to lose 4-3 at home to Freiburg.
Cologne appointed former Stuttgart and Eintracht Frankfurt coach Armin Veh as managing director on Wednesday.
The club, who qualified for the Europa League last season, have drawn three and lost 11 of their league matches.
Restricted to just four appearances for Cologne, veteran striker Claudio Pizarro has apparently found a part-time job to keep himself busy.
Gunners finished first as Red Star Belgrade and BATE Borisov could only draw 0-0 in group's other game.
Cologne have announced that their all-time record goal scorer Hans Schafer, who won the 1954 World Cup with West Germany, has died at the age of 90.
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