Real Sociedad forward Chori Castro has urged his men to remain calm when they face Shakhtar Donetsk.
La Real travel to Ukraine on Wednesday looking for the three points that will keep their slim hopes of qualification alive.
“We will need to remain calm," he told reporters.
“There's no point going crazy from the off because if you go behind against this type of team, it's very hard to turn things around."
The San Sebastian outfit have claimed just one point in this season’s Champions League, and need two wins from their final two matches to have even a hope of making the Last 16.