Manchester United are keeping a close eye on Paris Saint-Germain duo Edinson Cavani and Thiago Silva for a move in the summer, according to the Daily Mirror.

The Red Devils are willing to splurge up to £57m ($83.4m) for their signatures as Louis van Gaal looks to mount a title challenge for next season. Cavani could be a replacement for Radamel Falcao, whose loan deal from Monaco is unlikely to be made permanent in the summer after the striker failed to live up to expectations at Old Trafford.

Robin van Persie, who almost single-handedly won United the league title in 2012 has also not been at his best this season and spent the major part of the campaign on the sidelines due to injury. The Daily Mail reports that United are willing to hand the Dutchman £5m to facilitate an honourable exit in the summer so as to make room for further reinforcements.

On the defensive front, United are closely monitoring Thiago Silva as backup for Mats Hummels, who is Van Gaal's prime target to shore up his defensive wall.

The Brazilian centre-back is regarded as one of the best defenders in the world but is unlikely to come cheap given his high wages and stature in the PSG team, who are top of the league table and in the quarter finals of the Champions League.

However, the manager is confident that he can persuade the player to move to the Premier League, should United manage to secure their position in Europe's most coveted club competition in the remaining seven games.

It will be a massive boost for United, especially in Europe, where Silva has proved his worth by scoring the equaliser against Chelsea at Stamford Bridge, which saw them through into the next round.

United are also close on the heels of PSV Eindoven winger Memphis Depay where they have all but won the race against Liverpool for the Dutchman.