Manchester United will reject a deal to sign Radamel Falcao at the end of the season, according to ex-midfielder Ray Wilkins.

The Colombia international joined the club on deadline day in the summer transfer window but during an injury-affected season has scored just four goals in 20 appearances in all competitions.

Falcao's problems at United have led to the 29-year-old being an unused substitute in two of the club's last three matches, including in the 1-0 win over Newcastle United and the 2-1 defeat at Swansea City.

Reports suggest Falcao will be available for £44m ($67m) in the summer should United wish to secure a permanent deal for the forward but Wilkins expects manager Louis van Gaal to look elsewhere in attempts to add goals to his team.

"Falcao has been struggling for goals," he told Talksport. "He hasn't shown any type of form that we anticipated when he came to Manchester United.

"With the upmost of respect to him, his form has been very poor, we haven't seen anything like the player who destroyed Chelsea with Atletico Madrid a few years ago.

"They have already paid a £6m huge loan fee and his wages are extremely expensive. For them to take him on would require another £42m, I would think they will look elsewhere."

United will delay an official decision over the future of Falcao until the end of the season but Van Gaal's recent lack of confidence in the player suggests his days at Old Trafford are numbered. Latest reports indicate the club will offload the striker back to his parent club Monaco.

Falcao has at least 11 games remaining between now and the end of the campaign to win a long-term contract with United and with Robin van Persie out injured, he would be expected to start the FA Cup quarter-final against Arsenal on 9 March.