Manchester United reportedly set to strengthen their attacks with Jamie Vardy, Javier Hernandez and Alexis Sanchez on the list (Details, pics)

Manchester United are reportedly considering moves for Jamie Vardy, Javier Hernandez and Alexis Sanchez as they seek to strengthen their attack in January.

The Red Devils want to add some more firepower and provide extra back-up to Romelu Lukaku as Zlatan Ibrahimovic is continuing to struggle with injury, according to Sam Wallace at the Telegraph.

Arsenal are willing to sell Sanchez if they receive an acceptable offer, with Manchester City remaining the favourites for his signature, according to David Ornstein at BBC Sport.

However, the Red Devils have offered Arsenal £25 million for Sanchez and are also willing to sell Henrikh Mkhitaryan to the Gunners, per Fabrizio Romano and Ed Aarons at the Guardian.

The deal may also make sense for Arsenal, but Sanchez appears determined to move to City, and it may be difficult to persuade the Chile international his future lies anywhere other than the Etihad Stadium.

The England international would bring goals and has 10 for the season already for the Foxes. He would also be eligible to play for United in the UEFA Champions League. Vardy is also a target but would cost United £35 million, making him the most expensive of the three attackers, per Wallace.

Vardy has previously turned down a move to Arsenal but has said "that doesn't mean I wouldn't look at another offer," per Matt Law at the Telegraph.

Whether he would be willing to go from being Leicester's first choice to Lukaku's back-up remains to be seen, and United may also find his price tag a little high, considering he is now 31.United's third target is Hernandez, a man the Red Devils know well after he spent five years at the club before being sold to Bayer Leverkusen in 2015.

The Mexico international made a name for himself as a real goal-poacher during his time at Old Trafford, particularly as a substitute, and he was hugely popular among supporters.

Per Wallace, Hernandez is not wanted at West Ham United, while United manager Jose Mourinho has said previously he would not have allowed him to leave Old Trafford.

Hernandez has four goals in 17 Premier League outings for a struggling West Ham this season, and his future looks bleak under manager David Moyes.