Noel Whelan has urged the San Francisco 49ers to invest some cash into Leeds United to give the club a summer transfer boost.

Owner Andrea Radrizzani has warned it will be a “difficult summer” for United as the club plan to concentrate on loan signings and free and low-cost transfers.

Ex-Leeds striker Whelan is concerned that the club are giving themselves a mountain to climb by appearing not to take advantage of the wealth of the investment arm of San Francisco 49ers.

According to Forbes, the American Football giants are valued at £2.45billion and have an annual revenue of £370million.

Asked for his reaction to the noises coming from the club over the last week about summer transfer plans, Whelan told Football Insider: “I don’t like what I’m hearing, to be honest. If we haven’t got the money, and we clearly haven’t, we need some help. We need to get out of the league.

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“We had the investment last year from the San Francisco 49ers. Where are they right now? We know they invested £10million, but that’s a drop in the oceans for them. It’s nothing.

“Put your hand in your pocket and invest in the club. The team needs investment. The league is going to be even harder next season with the quality of the teams coming down and the likes of Nottingham Forest, Derby and Middlesbrough all going to be seriously competitive.

“I know we have spent a lot on Bielsa and his staff, but it feels like we’re doing things on the cheap, and that worries me.”

Radrizzani bought into Leeds in December 2016 before taking full control the following May when he bought out the stake of predecessor Massimo Cellino.

He subsequently sold 25 per cent of his Leeds’ shares to the investment arm of the San Francisco 49ers for £11million, but retains operational control of the club.

In other Leeds United news, it can be REVEALED that the club have been told it will cost £6.2million to seal attacker deal as talks set to begin.