A trader on the floor of the New York Stock Exchange.

The major averages are on pace for their first weekly loss in six weeks. Dan Skelly, the head of the Morgan Stanley Model Portfolio Solutions Equity Team tells CNBC's "Power Lunch" on Thursday the rally is not over, but investors have to be more careful now.

"Given how negative sentiment has been concerning fears of a U.S. recession, we think there could be modest upside for the market. However, investors would be prudent to be more selective at this stage of the cycle, given where overall market valuations are," Skelly said.