Markit Economics released its retail purchasing managers' index (PMI) for Eurozone on Thursday. Eurozone's construction purchasing managers' index (PMI) rise to 49.0 in January from 58.9 in December.
A reading above 50 indicates expansion in the sector, a reading below 50 indicates contraction.
Sales in Germany, France and Italy remained below 50.
"Sales were higher in January than the situation one year ago, although on a monthly basis they have slipped steadily since November. This loss of momentum is largely reflective of a slowdown in Germany, where sales have now fallen twice in the past three months, albeit marginally," an economist at Markit, Phil Smith, said.