India, Dec. 28 -- The war between major league IT firms and Cognizant seems to be intensifying as Infosys sent a notice to the firm, soon after IT giant Wipro had sued two of its former executives just days after joining Cognizant.

Wipro filed a lawsuit against former Chief Executive Officer Jatin Dalal and executives Mohd Haque just days after they joined Cognizant. Now, Infosys has also sent a letter to the firm, accusing it of poaching valuable employees.

In its notice, Infosys has accused Cognizant of using "unethical poaching techniques" after a few of its top management executives joined the firm, reported Moneycontrol. Till now, four top executives from Infosys have joined Cognizant.

"Non-compete clauses are not enforceable but ...