Click through the mini-gallery to see the four players. On one hand, if last season taught us anything, it was to never underestimate Ibrahimovic.
Matic's future is up in the air with Chelsea on the verge of signing Monaco midfielder Tiemoue Bakayoko. We have players that belong to the squad but can not play for next few months, [Marcos] Rojo, Ashley Young, Luke Shaw, if Zlatan stays.
The coach thinks it is "possible" the Swede will play for the club again despite suffering a knee injury that will keep the player out till January. "I don't like to speak about players who aren't ours".
Ibrahimovic made a decision to undergo his rehab at United's Carrington training complex despite his release, and that's enabled the Swede to impress the club in the face of persistent rumours linking him with a move to the USA or China. Jose Mourinho would want to utilise the services of the attacker to sharpen his side going into a big competition like Champions League.
However, he does fit the mound of a Mourinho striker for several other reasons.
'What he brings is hopefully goals. He's the kind of player that everybody knows he's a striker so we're not speaking about a multi-functional player or create doubts about positions on the pitch.
Hope that the youngster will be ready for the opening Premier League fixture against West Ham in August is also described as "slim".
Lukaku scored 25 times in 36 games in the Premier League last season to finish as the division's second-highest goal-socrer behind Harry Kane, leaving Everton have netted 53 goals in 110 top-flight appearances.