Please see 'here' for the energy scale of a (topological) magnetic monopole. It is around 11 TeV and I am impressed that the LHC reaches the scale of 14TeV already. Then have we observed the monopole already? If not, why?
Initially LHC was not designed to detect exotic objects like magnetic monopole. Only recently (in 2010) a new detector named MoEDAL (The Monopole & Exotics Detector at the LHC) has been installed in LHC, which in particular has designed to detect new particles like magnetic monopole or massive (pseudo-)stable charged particles.
This new detector (MoEDAL) has started operating from 2015. Data acquired in this experiment yet to analyzed. Therefore we have to wait to see the outcome of this new experiment. For a technical detail on LHC's monopole search, one can consult with this paper. CERN's Official webpage for this experiment can be found here.