West Ham and Tottenham came to blows this summer over the future of Hammers vice-captain Scott Parker, who was subject of a rejected £7million bid from the north London outfit.
Hammers co-owner David Sullivan accused Spurs of unsettling Parker with the bid before the midfielder signed a new four-year contract this summer.
Redknapp believes his former club also contacted his midfielder, Jamie O'Hara, about a move to Upton Park.
Redknapp claimed: "They were talking to Jamie O'Hara all through the summer. Jamie told me he'd been getting phone calls all summer."
If true, the allegations would break Premier League rule K3, which states that the buying party in a transfer must contact the player's club before speaking to him directly.
Redknapp has called for the scrapping of the rule, insisting that "tapping up" players is widespread within the game.
"Listen, it ("tapping up") happens in the game," Redknapp affirmed.
"We're all kidding ourselves if we think it doesn't go on in the game. Every player that gets transferred, someone's ringing him.
"It doesn't just suddenly happen. An agent will speak to an agent for a player. He will speak to the player. The player says 'yeah, I'd like to go to that club' and that's how it happens.
"If people don't think it happens at almost 99% of transfers then they are in the wrong world."