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Detection of periodicity in the broad-band non-thermal emission of blazarshas so far been proven to be elusive. However, there are a number of scenarioswhich could lead to quasi-periodic variations in blazar light curves. Forexample, orbital or thermal/viscous period of accreting matter around centralsupermassive black holes could, in principle, be imprinted in themulti-wavelength emission of small-scale blazar jets, carrying as such crucialinformation about plasma conditions within the jet launching regions. In thispaper, we present the results of our time series analysis of $\sim 9.2$year-long, and exceptionally well-sampled optical light curve of the BL Lac OJ287. The study primarily uses the data from our own observations performed atthe Mt. Suhora and Krak\'ow Observatories in Poland, and at the AthensObservatory in Greece. Additionally, SMARTS observations were used to fill insome of the gaps in the data. The Lomb-Scargle Periodogram and the WeightedWavelet Z-transform methods were employed to search for the possible QPOs inthe resulting optical light curve of the source. Both the methods consistentlyyielded possible quasi-periodic signal around the periods of $\sim 400$ and$\sim 800$ days, the former one with a significance (over the underlyingcolored noise) of $\geq 99\%$. A number of likely explanations for such arediscussed, with a preference given to a modulation of the jet productionefficiency by highly magnetized accretion disks. This supports the previousfindings and the interpretation reported recently in the literature for OJ 287and other blazar sources.

Detection of Possible Quasi-periodic Oscillations in the Long-term Optical Light Curve of the BL Lac Object OJ 287