 Complete the following phrase:  Witschge featured sparingly during his tenure, as the Catalans won back-to-back La Liga championships. He made his debut in the competition on 14 September 1991, playing the full 90 minutes in a 31 home win against Real Zaragoza. He faced intense competition for playing time as the three allotted slots for foreign players were usually taken up by Michael Laudrup, Hristo Stoichkov and his compatriot Ronald Koeman, and an injury ruled him out of the 