After an earthshaking selloff Thursday and Friday, and despite early indications of another brutal day Monday, several market strategists are already calling for a bounce—and looking out for potential opportunities amid the wreckage.

Read MoreDow futures skid over 450 points as Wall Street preps for steep selloff



"Key indicators reach required levels to go 'all in,'" Canaccord Genuity's chief U.S. strategist, Tony Dwyer, wrote in a Monday morning note. "With such pronounced weakness underneath the widely followed indices, we believe much of the global economic and Fed-related uncertainty is largely priced into the average stock, and now even the closely watched indices."

Dwyer had been waiting for four indicators to signal that it was time to take an aggressively bullish position on stocks: A jump in the CBOE Volatility Index to 20 or higher; a falling percentage of stocks above their short-term moving averages; weakening market momentum according to a separate technical indicator; and a declining number of bulls according to the Investor Intelligence newsletter writer survey.

"All four of our intermediate-term buy signals have hit required levels that surround a significant and sustainable low," Dwyer wrote.

Read More Five charts that prove this selloff is serious

