Cologne have taken their former goalkeeper Markus Proll on trial for a few days to see if he could be replace Faryd Mondragon, who will leave the club next month.

Proll, who made 123 appearances for Cologne between 1995 and 2003, has been out of work since his contract with Eintracht Frankfurt expired in the summer.

The 31-year-old has the chance to earn a return to the club as back-up to Miro Varvodic, should he impress Cologne's goalkeeping coach Alexander Bade and head coach Frank Schafer.

"We wanted to get an impression of what condition Markus Proll is in," said Schafer on his club's website. "We will give ourselves the necessary time to make up our minds."

Mondragon, who was first-choice goalkeeper until a fall-out with the former coach Zvonimir Soldo earlier this season, this week reached an agreement with Cologne to have his contract terminated at the end of the year to allow him to join Major League Soccer side Philadelphia Union.