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This paper presents preliminary results of a spectroscopic survey beingconducted at the VLT of fields with optically-selected cluster candidatesidentified in the EIS I-band survey. Here we report our findings for threecandidates selected for having estimated redshifts in the range z=0.8-1.1. Newmulti-band optical/infrared data were used to assign photometric redshifts togalaxies in the cluster fields and to select possible cluster members inpreparation of the spectroscopic observations. Based on the availablespectroscopic data, which includes 147 new redshifts for galaxies withIab<22-23, we confirm the detection of four density enhancements at aconfidence level >99%. The detected concentrations include systems withredshifts z=0.81, z=0.95, z=1.14 and the discovery of the firstoptically-selected cluster at z=1.3. The latter system, with three concordantredshifts, coincides remarkably well with the location of a firm X-raydetection (>5sigma) in a ~80ksec XMM-Newton image taken as part of this programwhich will be presented in a future paper (Neumann et al. 2002). The z>1systems presented here are possibly the most distant identified so far by theiroptical properties alone.Comment: 6 pages, A&A, accepted for publicatio

Optically-selected clusters at 0.8 $\la$ $\mathsfsl z$ $\la$ 1.3 in the EIS cluster survey