Private-equity firm GTCR has joined the suitors in pursuit of MoneyGram International, The Post has learned.

GTCR is in talks with management and is still several weeks away from making a binding bid, a source close to the situation said.

Several other buyout firms are also expressing interest in the No. 2 money-transfer company, the source said.

A deal for MoneyGram would mark one of the biggest investments for GTCR, whose founder, businessman Bruce Rauner, is running for Illinois governor as a Republican.

MoneyGram could fetch $2.5 billion in a sale.

Western Union is the biggest player in the money-transfer business and controls around 15 percent of the market.

Moneygram has around 5 percent. Both have had to match lower prices from online rivals to stay competitive.

Dealreporter first reported that Moneygram was for sale.

MoneyGram shares fell 1.3 percent yesterday to $20.36.

GTCR did not return calls. MoneyGram declined comment.